Having problems with your GMC Vandura ?
When I press brake pedal only one side has brake light. When I turn on headlights both back running lights come on, but when I press brake pedal only one side lights up. Turn signal only works on one side, the same side as the brake light that works. I have replaced fuses, blinker fuse, and light bulbs and can't get turn signals to both work and brake lights to both work.
Do you have a towbar fitted?? if so, check wiring installation. If not you may have a bad earth connection on that light cluster
Repair Help & Product Troubleshooting for GMC Vandura
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