Question about 2003 GMC Sierra 1500
If the brake light is working on the sierra, Check the right light in the left break socket. If that is good then. I would check continuity between the connection to the light on the trailer. Remember to always disconnect anything you are trying to check continuity or you may get a false reading. if that's good, check your power at the source where they first separate to go to there respective lights. Always trouble shoot from where you have power then go to next connection point. this should get the issue narrowed down.
Posted on Jun 25, 2009
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Posted on Jan 02, 2017
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