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Most likely its a bad ground. Check and make sure wires are snuggly placed. Then take an extra piece of bare wire, make contact on both the hitch side and the trailer side on bare metal. Check to see if bulb lights. Is bulb good? If all else fail take the trailer to a local repair shop. Its not a major expense.
If you bought the Honda hitch kit, a wiring harness and instructions are included. If you bought a different kit, buy the wiring harness from Honda. The harness connects to a plug located in one of the accesses panels in the back. You will have to take off the. Bumper facia to route the harness to the hitch. Be sure to use the rubber grommets to prevent the sheet metal of the rear quarter panel from wearing through the wire insulation and causing a blown fuse.
Sometime around 2000, GM started putting trailering pre-wire harnesses in the vehicle. Your truck may have this harness built in and would greatly simplify brake controller installation. Look under the glovebox and see if there is a wire harness tied off. There will be four wires in this harness, which should be run over to the steering column to use it. Most trailer brake controllers are compatible with this harness.
The four wires in the harness are: Red, 12vdc; black, ground; blue or purple, brake pedal; and brown or white, trailer brake wire to seven pin, four pin, or five pin connector at trailer hitch, if your truck came from the factory with a trailer hitch.
If you are adding the hitch and do not have the four wire harness, the under hood wires from your brake controller are Red, connect to one of the studs under the distribution box cover (the distribution box is on the driver's side against the firewall. Underneath the cover are two large threaded studs which are hot from the battery all the time); and the other wire from your brake controller would have to be run the length of the truck along the frame, tied off in several places, to the trailer hitch connector on the bumper. Follow the directions that came with trailer hitch wiring connector to connect this wire to the proper pin in the connector.
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Good luck!
The socket should be beside the tow hitch. If not you will need to connect a socket and patch it into the wiring of the rear lights. Here is the wiring diagram http://www.western-towing.co.uk/acatalog/Trailer_wiring.gif
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