Recommendation For Attaching 12V Trailer Power Wiring To Vehicle Battery Or Trailer Battery

Updated 07/28/2017 | Published 07/27/2017

Products Featured in This Question

10 Gauge Wire - Blue Primary - Per Foot

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$1.78

40 Amp In-Line Circuit Breaker - Perpendicular Mount Bracket

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$9.85

Question:

From where I connect the wire to plug in my 12 volt center pin connector in my 7 pin connector in the back of my Rv? And what kind o number wire I need? From my battery positive pole? Do I need to connect ground too? Thank you

asked by: Jorge M

Expert Reply:

The 12V power wire to your connector should be 10 gauge wire like # 10-1-1. When running it in your vehicle to the 7-way connector, it will need a 40 amp circuit breaker like # 9510. You run from the battery + terminal to the circuit breaker and then from the breaker to your 1 o'clock position when facing the trailer connector or 11 o'clock position from the back side of the connector.

If you are connecting your trailer to your trailer battery, I recommend using the same 10 gauge wire and running it from the same location on the trailer side connector to the battery + terminal on your trailer battery. Then run a 10 gauge wire from the battery - terminal to the bare metal frame of your trailer.

expert reply by: Jason S