To connect an auxiliary battery, I recommend using 10 gauge wire, like # 10-2-1 (per foot) to connect the 12V power wire on your trailer side 7-way connector to a junction box like # 38656. From there, you can run more of the same wire from the positive side of the battery to the same post where you previously connected the 12V wire on the junction box. To connect to the posts, you can use 3/16 inch ring terminals # 44-5310A.
If you don't already have a junction box, the 7-Way Molded Trailer... view full answer...
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