7 Pin Trailer Wiring Troubleshooting. I have hooked up a trailer light and it works manually, but I have not been able to get it to come on automatically. For more advanced issues that you can't fix on your own.
If so, does it have power when the ignition is off, or only when on? Anyone have a diagram of which pins supply which functions? There is not a pin on the truck that gets hot with brakes applied.
Wiring your four-pin trailer can be a challenge when you first do it, but it's a simple do-it-yourself task.
Locate the rubber grommet that surrounds the interior wiring harness where it feeds through the firewall.
Anyone have a diagram of which pins supply which functions? If you don't follow this your trailer (or tow vehicle) can't be used with any other implement. To troubleshoot your trailer wiring, connect a jumper wire to the connector pins and the continuity tester to the system's sockets.
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