Question Was Asked By - frank a

Wiring 12v Power Source to Battery on a Trailer

Question:

what is the proper way to wire 12 volt power from the 40 amp stud on my gmc savanna 3500 to my 7 pin trailer connecter? my van did not come from the factory with a tow package, it was wired @ my dealer. it would be used to charge a battery in a dump trailer.

asked by: frank a

Expert Reply:

Whatever pin the battery is wired to needs to have a wire run from the vehicle 7 way to the 40 amp stud or the battery itself. You will want a fuse or breaker in the circuit so as not to draw too much from the vehicle system and burn the circuit if you run straight to the battery. Usually a battery on a dump trailer will be wired to the large center post on the 7 pole. I have included a link to a page with a plug wiring diagram so you can see what should be where.

expert reply by: Patrick B

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