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Make sure that the wiring harness is properly grounded. Baring that, there is probably a short in the wiring somewhere. A short means the two wires used in trailer lighting are touching someplace.

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Q: 2007 tacoma prerunner i added a trailer harness but ever sense i plugged my trailer in my trailer lights wont come on when i turn on the switch all fuses are good but i have no power to lights?
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