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How Much Power Should I Make Available To Charge My Trailer Battery

Question:

I have installed this kit onto my trailer. Now Im installing a seven pin connector to the RV that will be pulling it. The RV doesnt have any wiring in place yet. For the black power supply 12 volt wire, how much capacity should I give it to charge the battery? I will be wiring directly from the RV engine battery and will be putting a circuit breaker or fuse close to the batteries. What size breaker or fuse should I ? I would like to use 12 gauge wire or smaller for the run.

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Expert Reply:

You will have to use 10 gauge wiring, part # 10-2-1, because the wiring run you need will be longer than 25'. You will also need to install a 4-way connnector on your motorhome before you are able to install the 7-way connector. The Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit, part # 119190KIT, will work for your motorhome. Once you get this installed, you can install the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires, part # ETBC7, you will get a 20 amp, 30 amp, and 40 amp circuit breaker with the kit. The 40 amp circuit breaker will go between your RV battery and the 12V hot lead of your 7-way connector. You will use either the 20 amp or 30 amp to go between the battery and your brake controller, if you install one. Your setup will not provide amperage to charge your RV battery.

I have included product description links, a weblink to wiring your vehicle with a 7-way connector, and video review links below.

Recommended Wire Gauge For Length Of Run
Recommended Wire Gauge For Length Of Run
(click to enlarge)
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