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2003 GMC Sonoma - Page 9 Questions & Answers
Turn signal blinker relay
there's the location of unit flasher. But for what I seen you could have a rear end ground problem. have a look hope it helps
Adjust electric windows
there is no adjustment but there is stopper that can be adjust you have to remove the door trim
Cranks backfires
That could be a timing issues when it back firesWhy ,no idea,not a question you can guess at as we do hereCould also be a vacuum leak & lean fuel mixWhen you say cranks the motor turns over nothing elseCranking has nothing to do with the motor starting or runningYou have a no start & back fire as I gather
Car horn
Who says it's shorted & where in the horn systemFind the problem & you find the shortI doubt it is shorted, but still have to find outwhat is happening,that you didn't tell us
Why will 1999 gmc not start or even turn mtr. over
Could be the starter, battery cable, key switch, or the neutral safety switch. Even an accessory on the engine could have the engine locked up.Do you have power at the starter posts when the key switch is in the start position ?
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