I have a 6ga wire running from the battery of my TV to a winch type quick disconnect at the rear of the truck and the corresponding connector attached to the batteries on the trailer. How do I isolate or disconnect this wire when the vehicle is shut off? Im thinking some type of solenoid? Any help on this project would be most appreciated.

Just purchase a battery separator. Don't need a solenoid.Battery Separator

THat one is bi-directional (Good for a motor home not needed by the O/P but the concept is good. Just you do not need Bi-Directional. one way is ok(Since the trailer will NEVER .. then again.. Go with the BI DirectionalI do (on occasion) hook muy car (not isolated) to the motor home to keerp the battery charged by means of the house converter.. Car battery is 5 years old and starting to show signs of age.. If I do not drive it at least 2x a week it shows signs of "low battery" after a week of gathering dust.So if your truck does that, You simply plug in overnight and the Bi-Directional charger.. will charge the TRUCK battery.

For $20 you can get a basic 85a relay like yhis one. Connect the trigger circuit to something that's only on when the engine is running. When you turn the engine off, the solenoid opens the charging circuit to the trailer.The battery separator is nice, but if you have only one battery in the truck I don't know if I want to let it go down to 12.8v before it separates.

Other thing he can use is a LSL Toad Charge. That will do the same thing.

BurbMan wrote:For $20 you can get a basic 85a relay like yhis one. Connect the trigger circuit to something that's only on when the engine is running. When you turn the engine off, the solenoid opens the charging circuit to the trailer.The battery separator is nice, but if you have only one battery in the truck I don't know if I want to let it go down to 12.8v before it separates.Your worried about bringing a 12 volt battery "down" to 12.8?. I suggest that you do your homework.

Isolating 12v current to trailer | Good Sam Community

13 Replies

BurbMan
Explorer III
Jun 25, 2018
For $20 you can get a basic 85a relay like yhis one. Connect the trigger circuit to something that's only on when the engine is running. When you turn the engine off, the solenoid opens the charging circuit to the trailer.

The battery separator is nice, but if you have only one battery in the truck I don't know if I want to let it go down to 12.8v before it separates.
wa8yxm
Explorer III
Jun 25, 2018
THat one is bi-directional (Good for a motor home not needed by the O/P but the concept is good. Just you do not need Bi-Directional. one way is ok
(Since the trailer will NEVER .. then again.. Go with the BI Directional

I do (on occasion) hook muy car (not isolated) to the motor home to keerp the battery charged by means of the house converter.. Car battery is 5 years old and starting to show signs of age.. If I do not drive it at least 2x a week it shows signs of "low battery" after a week of gathering dust.

So if your truck does that, You simply plug in overnight and the Bi-Directional charger.. will charge the TRUCK battery.
Ranger_Smith
Explorer
Jun 25, 2018
Just purchase a battery separator. Don't need a solenoid.

Battery Separator

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Isolating 12v current to trailer

13 Replies

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