7 Pin Trailer Plug Hot Wire. Features: - Establish a secure connection between your trailer and power supply - Black plastic cable prevents rusting, prolongs its service life - Provide connections for indicators, side lights. There is a lot wiring that you have to tie into your truck's wiring harness, but it is easier to do than it seems.
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Having the various pinout diagrams available is vital to troubleshooting and/or repairing. Work with a partner to test all your lights, including hazards and reverse. So, I just wired a fused hot wire from the battery to the wire on the back of the trailer plug.