I have a 2017 Colorado I just bought used. The trailer running lights are not working. The turn signals, brakes and hazards all work. I rewired the trailer and tested on another truck and it works. I also tested with the pin tester (four pin which is how I connected it) and one of them do not light up. I have checked the fuses and they are all good. We also tested the pin tester on another truck and they all lit up fine. Any suggestions?
Khaberman
I haven’t been able to solve this issue with my 2016. However the fuse that controls the trailer running lights for me keeps blowing. I can’t remember the fuse # but the trailer worked fine on another truck so I’m not sure what the issue is with the Colorado.
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Since this thread was revived I’ll come back to say I resolved my issue. No issue on the truck side. It was my trailer. Had a funky adapter that I was using to convert from an old 4 pin to my 4 pin on the truck. Turned out wiring was bad somewhere. I replaced the trailer harness and lights and threw in a new fuse and my issue was solved. Haven’t blown the fuse since.
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