84 ford e350 chassis - need help identifying parts

04-02-2012, 07:45 PM

Hello,

I recently bought an 1984 Tioga, Ford E350 chassis, 7.5L engine. I am troubleshooting the electrical arrangement and manuals and diagrams I accept don't testify some of the components that I see in the engine compartment. I have taken some pictures of these components located in the RH side of the Eng compartment.

Capeesh it if you lot can assist identify these items so I tin can motility forward. Cheers - Jay

Photo 1 - I think this is the starter motor relay. The principal and auxiliary bombardment cables connect to this component.

Photograph 5 - I think this is the bombardment isolator. The alternator BAT terminal wire connects up to this component.

Photograph 10 - I am not sure what this i is. simply i wire, if left asunder, the alternator will not plough over.

04-03-2012, 09:35 AM

Your photos are not numbered but none of the items are a starter relay.
I take it the photos are taken from the drivers side.

The fined affair is a battery isolator that someone has added.
The relay did the same thing as the battery isolator does before it was added. It is chosen a parallel charge relay. You lot exercise not demand both of them. I have seen the parallel charge relay also used as an emergency start relay.

Your starter relay (solenoid) should exist on the other fender by the other battery.

I do not know what yous are trying to show in the heart photo.
There is a Power Solenoid in the eye photo.

My 85 is wired like this:

/

04-03-2012, x:42 AM

I did not recollect the cables were big enough for the bottom photo to be a starter solenoid (relay). More the size I had on my 82 for the parallel accuse relay.
Unless the cable to the starter is not in the photograph.

Edit:
OK I see the other large cable now.

The wire disconnected is a green 14GA fuse link.
It should be the fuse link for the B+ wires from the alternator and other systems. See diagram higher up.
Information technology also looks similar the battery isolator is miss wired. The top wire on the middle goes on the bottom. It looks like there is non a wire on the bottom lug.
I think that wire is going over to the chief battery + (POS) post cable.

/

04-03-2012, 10:48 AM

Quote:

Originally Posted by subford View Post

Your photos are not numbered only none of the items are a starter relay.
I take it the photos are taken from the drivers side.

The fined thing is a battery isolator that someone has added.
The relay did the same affair every bit the battery isolator does before it was added. It is called a parallel charge relay. You do not demand both of them. I have seen the parallel charge relay as well used as an emergency start relay.

Your starter relay (solenoid) should be on the other fender by the other battery.

I do not know what yous are trying to show in the center photo.
There is a Power Solenoid in the center photo.

My 85 is wired like this:

/

subford. cheers.

-- Yes correct, these items are mounted inside the RH side of compartment. The pictures are as viewed looking from the driver's side.

-- If you put the mouse cursor over the photo, the proper noun of the photo file will be provided.

-- In the center photo, to the right of the "bluish finned" battery isolator as you have chosen it, is a component to which the large positive bombardment terminal wires fastened to. I can't see the body as clearly, merely information technology have similar looking characteristics to a "starter motor relay', or a bombardment isolator, and so I am not sure what is actually is. Is this the item which you take chosen a "power solenoid"?

-- The RV is designed to have an auxiliary batter system and according to some diagrams I received, at that place is supposed to exist an AUXILIARY Bombardment RELAY.

-- Additionally, co-ordinate to some documentation I accept, their is a feature called "Emergency First." There is a button labeled "emer start" under the dash, and when depressed, information technology is supposed to connect the auxiliary bombardment to the alternator to allow it the start the vehicle, in case the principal battery is expressionless.

Thanks for your feedback. Anything further would be appreciated.

Jay

04-03-2012, 11:01 AM

Quote:

Originally Posted by Wizard View Post

That bottom photo looks an awful lot similar a starter solenoid to me. When y'all say the loose wire the alternator won't plow over, I assume yous're referring to the starter won't turn over. That'south why I thing that's a starter solenoid.

Magician: Thank you for your reply.

-- That is correct. In the third photo, the moving-picture show shows that concluding loop asunder from the commodities. I traced this wire from the "blue finned" component above information technology. If I leave this wire disconnected and plough the ignition key, goose egg happens. When I connect this wire to the terminal, the starter motor volition plow over. The other thick wire (blackness wire just looks whitish in the last photo) runs downwardly to the starter.

-- In the kickoff photo, just below and ii the left of the "bluish finned" component, you lot can run into it partially. Yous tin can also see two heavy gauge black wires that connect to information technology. The end of one of those wires is continued to the bombardment cable clench which connects to the positive battery last. The other heavy black wire runs down to the starter/solenoid.

Any further thoughts?

Thanks Jay

04-03-2012, 11:06 AM

Quote:

Originally Posted past subford View Post

I did not recall the cables were big plenty for the lesser photograph to be a starter solenoid (relay). More than the size I had on my 82 for the parallel charge relay.
Unless the cable to the starter is non in the photograph.

Edit:
OK I run into the other big cablevision at present.

/

subford:

-- In the peak (or first photo), below and to the left of the blue finned component, you tin can see the component though a partial view. From the get-go photo, y'all can see two heavy gauge wires connecting to this part. 1 connects to the positive battery terminal direct, the other runs down to the starter/solenoid.

04-03-2012, xi:10 AM

That one solenoid in the picture show on the right, should be for starting the generator. Follow those wires & run across where they become.
The second solenoid to the left, lot of times motorbus builders would include them & when the switch fundamental was on it would turn 12V on to charge the double-decker batterys while driving downwardly the road.

Along in those years, coach builders didnt know any other way to seperate the 12V systems, (chassis battery or coach batterys) to keep from draining all the batterys at once, so they came upwardly with the solenoids to turn them off & on.

The blueish fin isolator, will only let 12V go i way while your camping & the chassis engine non running to keep from draining the chassis battery.

Both of those solenoids dont look to adept, and so best to get ahead & get two new ones before they put y'all down out on the road somewhere.
A improve more heavy duty solenoid to become other than those in the motion-picture show, like from a 70s~80s model Ford pickup. It is all metal & heavier congenital on the within & can stand the loftier heat the 12V will produce from being turned on constant.
The solenoids like used on battery electric golf carts, are real heavy duty & expect just similar the Ford solenoids, but boy they volition get to that billfold when paying for them.
Neil

04-03-2012, xi:15 AM

Quote:

Originally Posted past subford View Post

I did non think the cables were big enough for the lesser photo to be a starter solenoid (relay). More the size I had on my 82 for the parallel charge relay.
Unless the cable to the starter is not in the photograph.

Edit:
OK I encounter the other large cable now.

The wire disconnected is a green 14GA fuse link.
It should be the fuse link for the B+ wires from the alternator and other systems. Meet diagram to a higher place.

/

subford:

Bully edit on the photo. Yes, that helps immensely. Now I know you can come across what I am trying to describe.

-- QUESTION: If the auxiliary battery system is found to be non working properly, tin you recommend a production(due south) or arrangement(s) to supersede the battery isolator and/or parallel charge/emergency start relay?

-- I would like to keep the feature of being able to outset the vehicle using the auxiliary bombardment without having to bandy batteries and/or alter cables.

-- QUESTION: With that wire from the starter relay disconnect, the vehicle will non only start, but the forty-70 milliamp bombardment bleed disappears. So I guess the problems is either a short in the starter relay/solenoid, or in the starter motor. Does that sound feasible?

Cheers Again and so much for you lot help!

04-03-2012, 11:32 AM

Quote:

Originally Posted by subford View Post

I did not think the cables were large plenty for the lesser photograph to be a starter solenoid (relay). More than the size I had on my 82 for the parallel accuse relay.
Unless the cable to the starter is non in the photo.

Edit:
OK I see the other large cable now.

The wire disconnected is a green 14GA fuse link.
Information technology should be the fuse link for the B+ wires from the alternator and other systems. See diagram above.
Information technology also looks like the bombardment isolator is miss wired. The top wire on the center goes on the bottom. It looks like there is not a wire on the bottom lug.
I retrieve that wire is going over to the main battery + (POS) post cable.

/

subford: cheers!

--- Yes! The wire disconnected is a green 14GA fuse link.

--- The "A" in the wiring diagram above is probably the Amp meter, and not the Alternator. I did find your wiring diagram on a diagram I accept and it shows that "A" is either an AMMETER or warning indicator lamp. But I volition double check and confirm this. If that is right, so it looks like the voltage regulator could be the problem

Your thoughts?

--- There was never a wire continued to the empty terminal on that battery isolator. Which is why I was asking for recommendations on product or system replacements.

I recently purchased this and the previous owners told me that it had electric problems, but were not interested in finding them.

Cheers once again! What recommendations practice you accept at this point?

04-03-2012, 11:39 AM

Information technology looks like as I said above the battery isolator is miss wired. The top wire on the center post goes on the bottom. It looks similar there is not a wire on the bottom lug.
I call back that wire is going over to the main battery + (POS) mail cable.

Y'all will not accept a parallel accuse relay as that job is done past the bombardment isolator.
The solenoid is but for the emergency offset. It should click with the fundamental on when you button the button and connect both batteries in parallel.

The battery isolator should connect both batteries in parallel when the key is in the run position merely.

04-03-2012, 12:03 PM

Quote:

Originally Posted by subford View Post

It looks like as I said above the bombardment isolator is miss wired. The top wire on the centre post goes on the bottom. It looks like there is not a wire on the lesser lug.
I call up that wire is going over to the main battery + (POS) post cablevision.

You lot volition not have a parallel charge relay equally that chore is done by the battery isolator.
The solenoid is only for the emergency kickoff. It should click with the key on when yous push button the button and connect both batteries in parallel.

The bombardment isolator should connect both batteries in parallel when the cardinal is in the run position only.

subford: That clears it up a bunch!

--- Is in that location any procedure to test a battery isolator to know whether it is operating properly?

Because of the electrical problems they had, upward until now, have left out the auxiliary battery of the vehicle.
--
When I collection the vehicle dwelling house and started to do some bones checking, I discovered (or idea) was that the auxiliary bombardment was install backwards. But non sure how it is supposed to be installed. That is for another day.

-- Right now, I am trying to get the main vehicle battery/charging system working correctly.

In example y'all missed it, I was looking for production recommendations to replace the emergency start relay and bombardment isolator, if I cannot go them to operate correctly.

04-03-2012, 12:25 PM

The emergency showtime solenoid would exist sold by any motorcar function shop. Just ask for an starter solenoid for say a 1977 F-series truck.

I have no brand to recommend for the battery isolator.
I accept the Certain POWER battery isolator in my 1985 and it works OK. It is the one in the first diagram.

I can email y'all a PDF of the Sure Power instructions if you like. Just email me your e-mail address. My email address is at the bottom of this mail service.

Your system should be wired like this:

/

04-03-2012, 06:11 PM

Quote:

Originally Posted by C-Leigh Racing View Post

That one solenoid in the pic on the right, should be for starting the generator. Follow those wires & see where they become.
The second solenoid to the left, lot of times coach builders would include them & when the switch key was on it would plow 12V on to accuse the coach batterys while driving down the road.

Forth in those years, motorbus builders didnt know any other way to seperate the 12V systems, (chassis battery or jitney batterys) to proceed from draining all the batterys at once, so they came up with the solenoids to plow them off & on.

The blue fin isolator, volition but permit 12V go 1 way while your camping ground & the chassis engine not running to continue from draining the chassis battery.

Both of those solenoids dont wait to good, so best to become ahead & get ii new ones before they put you downwards out on the road somewhere.
A better more heavy duty solenoid to get other than those in the pic, like from a 70s~80s model Ford pickup. It is all metal & heavier built on the within & tin can stand the high heat the 12V will produce from being turned on constant.
The solenoids similar used on battery electrical golf carts, are real heavy duty & look just like the Ford solenoids, only boy they will get to that billfold when paying for them.
Neil

C Leigh: Cheers for your feedback.

I hold that these components don't look go so I am definitely going to replace them.

The blueish finned battery isolator is probably wired incorrectly as has been suggested, so you are right on rails at that place. I will be replacing this one soon.

I like the idea of using a heavier solenoid from a 1970's truck which will act as an emergency kickoff solenoid. I volition be on the chase for this component replacement as well.

The solenoid below and to the left of the battery isolator is the one I am focused on now. Though it works fine, some wire or component attached to information technology is causing a parasitic drain to a higher place the fifty milliamp threshold. So I am on the hunt for that problem.

Want to again cheers all for your collective wisdom. Information technology volition be a few days to get the components and install them. I volition certainly inquire for guidance if I run into any issues. Cheers again!

Jay

04-02-2012, 07:45 PM	#1
Member Fleetwood Owners Club Bring together Date: Mar 2012 Location: San Diego, CA Posts: 36	84 ford e350 chassis - need aid identifying parts Hello, I recently bought an 1984 Tioga, Ford E350 chassis, 7.5L engine. I am troubleshooting the electrical arrangement and manuals and diagrams I accept don't testify some of the components that I see in the engine compartment. I have taken some pictures of these components located in the RH side of the Eng compartment. Capeesh it if you lot can assist identify these items so I tin can motility forward. Cheers - Jay Photo 1 - I think this is the starter motor relay. The principal and auxiliary bombardment cables connect to this component. Photograph 5 - I think this is the bombardment isolator. The alternator BAT terminal wire connects up to this component. Photograph 10 - I am not sure what this i is. simply i wire, if left asunder, the alternator will not plough over.

04-03-2012, 09:35 AM	#ii
Senior Member Ford Super Duty Owner Join Engagement: December 2009 Location: Easton, Ks Posts: 2,766	Your photos are not numbered but none of the items are a starter relay. I take it the photos are taken from the drivers side. The fined affair is a battery isolator that someone has added. The relay did the same thing as the battery isolator does before it was added. It is chosen a parallel charge relay. You lot exercise not demand both of them. I have seen the parallel charge relay also used as an emergency start relay. Your starter relay (solenoid) should exist on the other fender by the other battery. I do not know what yous are trying to show in the heart photo. There is a Power Solenoid in the eye photo. My 85 is wired like this: / __________________ Pecker 1995 COACHMEN Santara 350FL on a 1994 Ford F53 subford@gmail.com

04-03-2012, x:42 AM	#four
Senior Fellow member Ford Super Duty Owner Bring together Engagement: December 2009 Location: Easton, Ks Posts: 2,766	I did not recollect the cables were big enough for the bottom photo to be a starter solenoid (relay). More the size I had on my 82 for the parallel accuse relay. Unless the cable to the starter is not in the photograph. Edit: OK I see the other large cable now. The wire disconnected is a green 14GA fuse link. It should be the fuse link for the B+ wires from the alternator and other systems. See diagram higher up. Information technology also looks similar the battery isolator is miss wired. The top wire on the middle goes on the bottom. It looks like there is non a wire on the bottom lug. I think that wire is going over to the chief battery + (POS) post cable. / __________________ Bill 1995 COACHMEN Santara 350FL on a 1994 Ford F53 subford@gmail.com

04-03-2012, 10:48 AM	#5
Fellow member Fleetwood Owners Order Join Date: Mar 2012 Location: San Diego, CA Posts: 36	Quote: Originally Posted by subford Your photos are not numbered only none of the items are a starter relay. I take it the photos are taken from the drivers side. The fined thing is a battery isolator that someone has added. The relay did the same affair every bit the battery isolator does before it was added. It is called a parallel charge relay. You do not demand both of them. I have seen the parallel charge relay as well used as an emergency start relay. Your starter relay (solenoid) should be on the other fender by the other battery. I do not know what yous are trying to show in the center photo. There is a Power Solenoid in the center photo. My 85 is wired like this: / subford. cheers. -- Yes correct, these items are mounted inside the RH side of compartment. The pictures are as viewed looking from the driver's side. -- If you put the mouse cursor over the photo, the proper noun of the photo file will be provided. -- In the center photo, to the right of the "bluish finned" battery isolator as you have chosen it, is a component to which the large positive bombardment terminal wires fastened to. I can't see the body as clearly, merely information technology have similar looking characteristics to a "starter motor relay', or a bombardment isolator, and so I am not sure what is actually is. Is this the item which you take chosen a "power solenoid"? -- The RV is designed to have an auxiliary batter system and according to some diagrams I received, at that place is supposed to exist an AUXILIARY Bombardment RELAY. -- Additionally, co-ordinate to some documentation I accept, their is a feature called "Emergency First." There is a button labeled "emer start" under the dash, and when depressed, information technology is supposed to connect the auxiliary bombardment to the alternator to allow it the start the vehicle, in case the principal battery is expressionless. Thanks for your feedback. Anything further would be appreciated. Jay

04-03-2012, 11:01 AM	#6
Member Fleetwood Owners Club Join Date: Mar 2012 Location: San Diego, CA Posts: 36	Quote: Originally Posted by Wizard That bottom photo looks an awful lot similar a starter solenoid to me. When y'all say the loose wire the alternator won't plow over, I assume yous're referring to the starter won't turn over. That'south why I thing that's a starter solenoid. Magician: Thank you for your reply. -- That is correct. In the third photo, the moving-picture show shows that concluding loop asunder from the commodities. I traced this wire from the "blue finned" component above information technology. If I leave this wire disconnected and plough the ignition key, goose egg happens. When I connect this wire to the terminal, the starter motor volition plow over. The other thick wire (blackness wire just looks whitish in the last photo) runs downwardly to the starter. -- In the kickoff photo, just below and ii the left of the "bluish finned" component, you lot can run into it partially. Yous tin can also see two heavy gauge black wires that connect to information technology. The end of one of those wires is continued to the bombardment cable clench which connects to the positive battery last. The other heavy black wire runs down to the starter/solenoid. Any further thoughts? Thanks Jay

Johnny Spitsberg

84 ford e350 chassis - need help identifying parts

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04-03-2012, 11:06 AM	#7
Member Fleetwood Owners Club Join Date: Mar 2012 Location: San Diego, CA Posts: 36	Quote: Originally Posted past subford I did not recall the cables were big plenty for the lesser photograph to be a starter solenoid (relay). More than the size I had on my 82 for the parallel charge relay. Unless the cable to the starter is non in the photograph. Edit: OK I run into the other big cablevision at present. / subford: -- In the peak (or first photo), below and to the left of the blue finned component, you tin can see the component though a partial view. From the get-go photo, y'all can see two heavy gauge wires connecting to this part. 1 connects to the positive battery terminal direct, the other runs down to the starter/solenoid.

04-03-2012, xi:10 AM	#eight
Senior Member Join Date: Feb 2012 Location: Nashville NC Posts: 637	That one solenoid in the picture show on the right, should be for starting the generator. Follow those wires & run across where they become. The second solenoid to the left, lot of times motorbus builders would include them & when the switch fundamental was on it would turn 12V on to charge the double-decker batterys while driving downwardly the road. Along in those years, coach builders didnt know any other way to seperate the 12V systems, (chassis battery or coach batterys) to keep from draining all the batterys at once, so they came upwardly with the solenoids to turn them off & on. The blueish fin isolator, will only let 12V go i way while your camping & the chassis engine non running to keep from draining the chassis battery. Both of those solenoids dont look to adept, and so best to get ahead & get two new ones before they put y'all down out on the road somewhere. A improve more heavy duty solenoid to become other than those in the motion-picture show, like from a 70s~80s model Ford pickup. It is all metal & heavier congenital on the within & can stand the loftier heat the 12V will produce from being turned on constant. The solenoids like used on battery electric golf carts, are real heavy duty & expect just similar the Ford solenoids, but boy they volition get to that billfold when paying for them. Neil

04-03-2012, xi:15 AM	#nine
Member Fleetwood Owners Club Join Date: Mar 2012 Location: San Diego, CA Posts: 36	Quote: Originally Posted past subford I did non think the cables were big enough for the lesser photo to be a starter solenoid (relay). More the size I had on my 82 for the parallel charge relay. Unless the cable to the starter is not in the photograph. Edit: OK I encounter the other large cable now. The wire disconnected is a green 14GA fuse link. It should be the fuse link for the B+ wires from the alternator and other systems. Meet diagram to a higher place. / subford: Bully edit on the photo. Yes, that helps immensely. Now I know you can come across what I am trying to describe. -- QUESTION: If the auxiliary battery system is found to be non working properly, tin you recommend a production(due south) or arrangement(s) to supersede the battery isolator and/or parallel charge/emergency start relay? -- I would like to keep the feature of being able to outset the vehicle using the auxiliary bombardment without having to bandy batteries and/or alter cables. -- QUESTION: With that wire from the starter relay disconnect, the vehicle will non only start, but the forty-70 milliamp bombardment bleed disappears. So I guess the problems is either a short in the starter relay/solenoid, or in the starter motor. Does that sound feasible? Cheers Again and so much for you lot help!

04-03-2012, 11:32 AM	#10
Member Fleetwood Owners Club Join Date: Mar 2012 Location: San Diego, CA Posts: 36	Quote: Originally Posted by subford I did not think the cables were large plenty for the lesser photograph to be a starter solenoid (relay). More than the size I had on my 82 for the parallel accuse relay. Unless the cable to the starter is non in the photo. Edit: OK I see the other large cable now. The wire disconnected is a green 14GA fuse link. Information technology should be the fuse link for the B+ wires from the alternator and other systems. See diagram above. Information technology also looks like the bombardment isolator is miss wired. The top wire on the center goes on the bottom. It looks like there is not a wire on the bottom lug. I retrieve that wire is going over to the main battery + (POS) post cable. / subford: cheers! --- Yes! The wire disconnected is a green 14GA fuse link. --- The "A" in the wiring diagram above is probably the Amp meter, and not the Alternator. I did find your wiring diagram on a diagram I accept and it shows that "A" is either an AMMETER or warning indicator lamp. But I volition double check and confirm this. If that is right, so it looks like the voltage regulator could be the problem Your thoughts? --- There was never a wire continued to the empty terminal on that battery isolator. Which is why I was asking for recommendations on product or system replacements. I recently purchased this and the previous owners told me that it had electric problems, but were not interested in finding them. Cheers once again! What recommendations practice you accept at this point?

04-03-2012, 11:39 AM	#xi
Senior Member Ford Super Duty Owner Join Date: December 2009 Location: Easton, Ks Posts: ii,766	Information technology looks like as I said above the battery isolator is miss wired. The top wire on the center post goes on the bottom. It looks similar there is not a wire on the bottom lug. I call back that wire is going over to the main battery + (POS) mail cable. Y'all will not accept a parallel accuse relay as that job is done past the bombardment isolator. The solenoid is but for the emergency offset. It should click with the fundamental on when you button the button and connect both batteries in parallel. The battery isolator should connect both batteries in parallel when the key is in the run position merely. __________________ Bill 1995 COACHMEN Santara 350FL on a 1994 Ford F53 subford@gmail.com

04-03-2012, 12:03 PM	#12
Member Fleetwood Owners Club Join Date: Mar 2012 Location: San Diego, CA Posts: 36	Quote: Originally Posted by subford It looks like as I said above the bombardment isolator is miss wired. The top wire on the centre post goes on the bottom. It looks like there is not a wire on the lesser lug. I call up that wire is going over to the main battery + (POS) post cablevision. You lot volition not have a parallel charge relay equally that chore is done by the battery isolator. The solenoid is only for the emergency kickoff. It should click with the key on when yous push button the button and connect both batteries in parallel. The bombardment isolator should connect both batteries in parallel when the cardinal is in the run position only. subford: That clears it up a bunch! --- Is in that location any procedure to test a battery isolator to know whether it is operating properly? Because of the electrical problems they had, upward until now, have left out the auxiliary battery of the vehicle. -- When I collection the vehicle dwelling house and started to do some bones checking, I discovered (or idea) was that the auxiliary bombardment was install backwards. But non sure how it is supposed to be installed. That is for another day. -- Right now, I am trying to get the main vehicle battery/charging system working correctly. In example y'all missed it, I was looking for production recommendations to replace the emergency start relay and bombardment isolator, if I cannot go them to operate correctly.

04-03-2012, 12:25 PM	#13
Senior Member Ford Super Duty Owner Join Date: Dec 2009 Location: Easton, Ks Posts: 2,766	The emergency showtime solenoid would exist sold by any motorcar function shop. Just ask for an starter solenoid for say a 1977 F-series truck. I have no brand to recommend for the battery isolator. I accept the Certain POWER battery isolator in my 1985 and it works OK. It is the one in the first diagram. I can email y'all a PDF of the Sure Power instructions if you like. Just email me your e-mail address. My email address is at the bottom of this mail service. Your system should be wired like this: / __________________ Nib 1995 COACHMEN Santara 350FL on a 1994 Ford F53 subford@gmail.com

04-03-2012, 06:11 PM	#fourteen
Member Fleetwood Owners Club Join Engagement: Mar 2012 Location: San Diego, CA Posts: 36	Quote: Originally Posted by C-Leigh Racing That one solenoid in the pic on the right, should be for starting the generator. Follow those wires & see where they become. The second solenoid to the left, lot of times coach builders would include them & when the switch key was on it would plow 12V on to accuse the coach batterys while driving down the road. Forth in those years, motorbus builders didnt know any other way to seperate the 12V systems, (chassis battery or jitney batterys) to proceed from draining all the batterys at once, so they came up with the solenoids to plow them off & on. The blue fin isolator, volition but permit 12V go 1 way while your camping ground & the chassis engine not running to continue from draining the chassis battery. Both of those solenoids dont wait to good, so best to become ahead & get ii new ones before they put you downwards out on the road somewhere. A better more heavy duty solenoid to get other than those in the pic, like from a 70s~80s model Ford pickup. It is all metal & heavier built on the within & tin can stand the high heat the 12V will produce from being turned on constant. The solenoids similar used on battery electrical golf carts, are real heavy duty & look just like the Ford solenoids, only boy they will get to that billfold when paying for them. Neil C Leigh: Cheers for your feedback. I hold that these components don't look go so I am definitely going to replace them. The blueish finned battery isolator is probably wired incorrectly as has been suggested, so you are right on rails at that place. I will be replacing this one soon. I like the idea of using a heavier solenoid from a 1970's truck which will act as an emergency kickoff solenoid. I volition be on the chase for this component replacement as well. The solenoid below and to the left of the battery isolator is the one I am focused on now. Though it works fine, some wire or component attached to information technology is causing a parasitic drain to a higher place the fifty milliamp threshold. So I am on the hunt for that problem. Want to again cheers all for your collective wisdom. Information technology volition be a few days to get the components and install them. I volition certainly inquire for guidance if I run into any issues. Cheers again! Jay

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