Question:
What gauge wire do you need to charge the battery on a camper from the truck
asked by: Don E
Helpful Expert Reply:
The wire that runs from the vehicle's battery to the 7-way trailer connector and then from the 7-way trailer connector to the trailer battery should be at least a 10 gauge. If you don't have any 10 gauge wire you can purchase part # 10-1-1 by the foot. Please note, you will need a circuit breaker part # 9510 on this charge line wire about 6" away from the battery on the tow vehicle. The 7-way trailer connector can then be used to attach and disconnect the charge line between the tow vehicle and trailer.
40 Amp In-Line Circuit Breaker - Perpendicular Mount Bracket
Pollak Metal 7-Pole, RV-Style Trailer Socket - Vehicle End