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Brake lights go off when I turn headlights on in my 90 GMC Sierra.

(1990 GMC 1500 Pickup)
in Gulf Breeze, FL on October 02, 2010
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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