12 Volt Pin Not Working on 2001 Chevy Silverado 7-Way Trailer Connector

Question:

I had to replace the 7-way connector plug on my trailer. When I plugged it back into the truck the trailer lights came on but not correctly. I rewired it to make sure I had done it correctly, with the same results. When I plugged my electric jack into the truck, it didnt work so assumed the problem is with the the trucks 7-pin. I tested each pin with a basic circuit tester and the light did not come on for the battery pin. The light came on for the other pins. What do I do now? Thank you so much.

1

Helpful Expert Reply:

The first thing we need to do is make sure both the trailer and vehicle side 7-Ways are wired up correctly to work with each other. I have included a couple of pictures that show the backs of vehicle and trailer side 7-Ways and the functions for each of the locations (ignore the wire colors and just focus on the functions).

If everything is where it should be then the problem could be a tow package fuse. Under the hood and under the covers for the power distribution box there is a post on the left side (if facing the motor from the front of the truck) towards the front of the power distribution box. The larger fuse location nearest this post is for the 12 volt power wire.

It is possible that the fuse shorted when you where rewiring things and just didn't notice it. Worst case scenario you will have to attach your own wire to that post, insert a 40 amp fuse in that location, and attach the wire to the back of the 7-Way. But if the 12 volt circuit was working before then it is likely a fuse and you won't have to run a wire. But I have included a help article that, in part, covers part of this.

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helpful expert reply by:
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Michael H

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