Question about 1991 Chevrolet S-10 Blazer

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When I turn on my headlights, my radio goes dark and plays static. The domelight and floor lights go on, my dashboard lights don't work, and my tail lights don't work. If the headlights are off, the radio lights back up and can be tuned, but interior lights stay on. I did change out the blinker switch (round thing) a week ago because my left blinker did not blink. When replaced, the blinkers bithe worked, but the dashboard arrow stayed lit when headlights were on. Now it's not. Not sure if this is related, but sure seems coincidental!

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Check for a loose ground. on vehicles the ground is as important as a power wire if not i would suggest taking a closer look at your headlight switch.

Posted on Apr 30, 2010

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It sure sounds like you have a case of "sneak circuits"
These are usually caused by a bad ground somewhere and something is "grounding" through the light bulbs.
Have you changed any wiring or installed a stereo or some other accessory?
You might use a jumper wire and ground the dash and other areas to the negative battery post as a way to find the culprit.

Posted on Apr 30, 2010

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1 Answer

Headlights don't work why?


Test the headlight switch as follows.
  • Move your car to a dark area, such as waiting until night or moving to a dark garage, to test your headlight switch.
  • 2Turn on your car, so you can see your dashboard lights. Note whether some of your dashboard lights fail to illuminate.


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  • Turn on your car's headlights. Note whether your car's headlights illuminate.
  • 4Press the high beam lever to activate your high beams. Note whether your high beams activate.
  • 5Put your car in "Park." Move to the back of the car. Note whether your parking lights are illuminated.
  • 6View any remaining driving lights, such as lights above the license plate. Note whether these lights come on.
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