Heres the deal I have a enclosed car trailer, I want to be able to turn on the interior lights of the trailer while my 04 f350 is not running ....anyone know what wire(s) I need to switch on my truck so this wire is hot always not only when the trucks running?????

 

you may have to rig up something on your own.. i riged up a "hot wire" between my truck and trailer batteries cause when the trailer generator is on it can charge the truck battery too... so i could run stereo in the truck and charge the battery etc....also charges the trailer batteries off the truck alternator while traveling...i just ran an extra wire with its own plug.

 

Hey Jetjock16, that sounds like a sweet set-up! What gauge wire did you run from your truck's 12v system, and where did you run it from, just the + side of the battery? Thanks.

 

i used like a 12 gauge i think... i ran it off the positive of the battery.. im sure i should of used a bigger wire but i got it fused at both ends with 15 amp fuses and theyve never blew..and it works fine... i just got a generac plug from autozone and wired it up right by the trailer plug on the bumper

 

What about a battery isolator on the trailer with a second battery?