Question about 1999 GMC Suburban

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I have a 1999 gmc suberban when my head lights are off my Break lights work and my turn singal works fine as well. But when I turn the lights on and turn my turn singal either right or left they blink very fast when i step on the breaks and when i step on the brakes i get no break lights at all and when the turn singal on the third break light kind of blink and the back turn lights blink but as soon as i thouch the breaks i get nothing but the third break light

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First thin you need to check if all turn signal bulbs are working (Front and back). Replace the bulb if one of them is not working. If all bulbs are OK, locate the flasher unit under the dash by turning on flasher and feel flasher unit clicking. the turn flasher unit looks ths same and is close to the signal flash unit and may be interchangable. switch the 2 units and see if the turn flashers work now and replace faulty flash unit.

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Posted on May 27, 2011

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