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Showing results for tags 'running'.
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I have a 2015 GMC Sierra and I had a light bar in the back for the brake lights connected to the 4 plug trailer light connector, one morning I started my truck up and the light bar was on working fine five minutes later I go out to my truck and the light bar was off so initially I check the fuses and all seem goodthe blinker lights and brake lights work fine for the trailer but the running lights don't work so I unplug the bar and tested each connector with a tester and found the running lights don't work at the plug. is there anything I can check before I start following wires?