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Formally called the Chevrolet C/K, C/K is a series of trucks manufactured by General Motors and marketed under the Chevrolet and GMC brands. The C/K line includes pickup trucks, medium-duty, and heavy trucks.

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92 GMC, my taillights stay on whenever I turn on the truck.

On my 92 GMC, my taillights stay on whenever I turn on the truck. When I press the brakes, the brake lights do not turn on. Every time I turn on the headlights, the taillights turn off, nothing works. I have checked all fuses, they are good. I also changed out the brake switch. I can't seem to find the issue to this problem. I have also noticed that the middle bulb on my taillights are getting hot to where it melted part of the plastic cover. Im at a lost, does anyone know or have any ideas how to fix this issue?

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Hi @garrickbegay

Here's the diagnosis of the rear exterior lamps section from the 1994 GMC truck service manual that may help.

Hopefully it is also applicable to your model.

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Garrick Begay sera éternellement reconnaissant.
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