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So my low beams will not turn on at all in my 96 blazer but high beams, side markers, and blinkers work fine. I replaced both Headlights to make sure they weren’t burnt out and that didn’t work, just replaced the headlight switch and still nothing. Anybody else have any other ideas I can try?
 

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1991 GMC Sonoma 4.3
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After checking the fuses and power, do all your other lights operate like they used to? Any dimming or fast flashing on any of your indicators? Are the low beams actually on but really dim? It could be a bad ground for the headlight, which can honestly manifest some other weird lighting behavior. Check the resistance on the headlight connector to ground. I had to open it up and re-solder a corroded connection, but it corrected a very similar issue for me after chasing bulbs around the truck.
 
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