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How to Charge a Trailer Battery Through a 7-Way Connector

Question:

I need to charge a marine 12v battery that powers a winch and tongue jack in a 24inch enclosed race car trailer. The tow vehicle is a Toyota Tundra and has 7 pin round connector. I want the trailer battery to charge from the Tundra when the 7 pin is connected.

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Expert Reply:

You can put a maintenance charge on your trailer battery with the 12 volt accessory circuit of the 7-way. The 1:00 position of your 7-way carries this circuit. You would just need to run a length of 10 gauge wire like part # 10-1-1 (sold by the foot), from this pin to the positive terminal of the battery.

You should note that this won't charge a dead battery, but it will keep the battery topped off when you are towing the trailer.

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Jameson C

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