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Activating 12 Volt Accessory Circuit of 7-Way to Power Boat Trailer Winch  


Hello, I just purchased a boat and ran into difficulties trying to tow it away. The owner has a truck for towing and there are two separate round 7-way connectors one for the truck/trailer lighting and one for the electric lift. I have a 2011 Ford F-150 truck with both the standard 4-pin receptacle and 7-way receptacle under the bumper. I was instructed to use one 7-pin plug for the lights which worked properly and then remove it and use the other 7-pin plug from the lift to the truck for lift power. The lift would not work and had no lights/power. After some discussion, I was told that I needed to run a separate wire from the battery to the receptacle for 12vdc power with the proper amperage for the lift, and was told that was my problem. Im not sure I agree but perhaps that is done to protect the lighting system. If that is true, please advise. Otherwise, I wonder if the lift jack power is not connected at the proper location on the connector plug. It appears 12vdc battery power goes through #4. Finally, wouldnt it just be easier and simpler and safer to run the 12vdc wire from the lift to the same connector plug used for the lights at screw #4? Thanks


Expert Reply:

The advice you received is correct. You will want to run a length of 10 gauge wire from the 7-way connector on the pin in the 1:00 position to the positive terminal of the battery through a breaker like part # 9510. For wire we have the part # 10-1-1 which is sold by the foot.

The other lighting circuits you mentioned aren't going to carry a high enough amperage rating for powering the lift so that is why you have to run the wire mentioned.

Not every 7-way has this circuit completed. That is why you have to complete yours.

expert reply by:
Jameson C

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