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But the 6 show a 12V as one of it's wires. Wouldn't that be for that purpose?
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That would work for charging a battery or accessories inside the trailer (dome lights, radio, etc). I'm happy using the 6 hole round connectors on just about everything. Most of the time I just have the bare minimum in use anyway (3 for lights, 1 for ground and 1 for brakes).