Question about GMC Cars & Trucks
I took off my bumper so I could detach a hitch and when i put my bumper back on and reconnected my tag lights, neither those nor my dash lights were working. I've tried all the different combinations with the wires to the tag lights and nothing has worked.
Maybe you didn't reconnect the ground for those lights. Check for tail light fuse or IP lights fuse. You may have to get a test light or voltmeter, and start looking for where power is lost. Start at the rear light sockets, and work back to the front, to the park light switch.
Posted on Dec 31, 2013
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Posted on Jan 02, 2017
SOURCE: Brake lights do not work
This is a well documented problem, replace the turn signal/multifunction switch to correct this issue, this very problem happened on my GMC, it is a 99 as well, replaced the switch as instructed by a chevy forum member and it fixed the problem
Posted on Nov 07, 2008
I had similar problem with my 97 sierra... I only lost 1 light, then brake lights stayed on all the time... turns out the "t" connector for the trailer harness under rear bumper was rotted inside...unplugged the 2 parts of the harness and pluged them into each other with out the "T" harness.... everything works great... Hope it helps ya
Posted on Feb 27, 2009
If you don't have a manual, just get a test light, and ground it to your door hinge. At the back of every fuse, you will see part of the metal filament showing through. Touch your test light to each side of the fuse. You should have power to both sides of every fuse (when your key is on). If no voltage on one side, the fuse is burnt.
Posted on Jun 23, 2009
I suggest that you visit the autozone.com website and register the vehicle. It doesn't cost anything and will give you access to an online repair manual for the vehicle. The wiring diagrams should be available there. Hope this helped and best wishes.
Posted on Sep 01, 2009
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