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How To Charge On Board Trailer Battery with 7-Way On Tow Vehicle

Question:

Can I hook that black terminal on the fuse block from the seven-way directly to a battery that powers my winch to keep it charged? The tow vehicle is a 2021 Silverado 1500 and the trailer battery is running a harbor freight 2500 wench That is on a crane to pick up logs.

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Expert Reply:

Yes, the battery charge line circuit which is usually a black wire can be used to charge an on-board trailer battery. The best way to do this is by running a wire from the trailer junction box to the battery. If you don't have a junction box I recommend upgrading to the Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector part # 277-000141. The size of wire used to run to the battery will need to be a minimum of 10 gauge part # 10-1-1

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Conner L

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