Trailer wiring

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Winch on the trailer needs a battery beside it. The 7th power wire back from the truck can not carry enough current for serious winching .
Counting on the trailer frame and in particular the hitch for a ground/chassis return connection . Is being overly optimistic.
 
On our tow vehicles, for hauling work boats, we ran a positive cable from the battery, to the rear, connected to a battery jumper quick connect, and grounded it to the frame, close to the plug. We put the other end of the quick connect on the winch . All our vehicles had dual batteries, so we had plenty of power. And yes, we used a heavy duty, resetable circuit breaker.
 
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