Question about 1999 GMC Sonoma

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I have a blinker problem. When my high beams come on when it turns dark and I use my left blinker it blinks real fast and it makes all my blinkers blink real fast.

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Same thing happened to me, but the turn signal outside the car was not working just on the dash it showed it blinking real fast. The mechanic there said I had a bad light bulb, replaced it and everything is fine. If you change one bulb and it keeps on blinking change the other bulb.

Posted on Sep 13, 2010

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Bad ground, or check all your bulbs. Usually its a ground in the back of the truck under where the spare is. If its not the ground check the bulbs. Please rate Thank you

Posted on Sep 13, 2010

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