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  1. GreyWolfJeeper

    2020 Yukon Tail Light Assembly partially working

    I thought I would post my resolution in case anyone else runs into a similar issue. I gave up troubleshooting, took the car to a local shop that has an employee who is an expert in vehicle electrical systems. The individual wire was diagnosed as having a break somewhere in the harness. I was...
  2. GreyWolfJeeper

    2020 Yukon Tail Light Assembly partially working

    I checked the trailer connector with a multimeter and the running lights blade registered voltage fine. No corrosion on both sides either. I did notice that the each front side marker light is on the same fuse as the rear running light. The fuse is good and the side marker light is working...
  3. GreyWolfJeeper

    2020 Yukon Tail Light Assembly partially working

    Thanks, good idea! The light seems to have stopped after a recent towing trip too. i'll check there next.
  4. GreyWolfJeeper

    2020 Yukon Tail Light Assembly partially working

    Yes, it has the Max Tow package, with the OEM 7-pin connector.
  5. GreyWolfJeeper

    2020 Yukon Tail Light Assembly partially working

    I checked each wire in the harness, and the green and yellow wires were showing zero voltage. I didn't have the backup light on, so it looks like the green wire is the culprit. So, now I know the problem is happening somewhere before the wiring harness. Not sure there is much else I can do...
  6. GreyWolfJeeper

    2020 Yukon Tail Light Assembly partially working

    Thanks, I will try to check each wire with a multi-meter. I didn't think of swapping the left and right light assemblies. I can try that too.
  7. GreyWolfJeeper

    2020 Yukon Tail Light Assembly partially working

    Hi All - I have a 2020 Yukon SLT, and the rear passgenser tail light is not working. In the assembly there appears to be the brake light LED, the running light LED, the turn signal, and the backup light (with a regular bulb). So specifically, the running light LED is not working - everything...

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