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1990 GMC 1500 Pickup Question: Brake lights go off when I turn headlights on in my 90 GMC Sierra.

 

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Rusty52, 4.3L V6, Gulf Breeze, FL, October 02, 2010, 12:24
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My brake lights go off when I turn the headlights on in my 90 GMC Sierra and the rear parking lights do not come on when I turn the lights on. I've replaced the headlight/parking switch and replaced the bulbs. They still don't come on. Any idea on what to do next?

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