SOURCE: I have a 2004 Envoy
This sounds like a loose connection/bad wire somewhere for the low beam lights. Can't really give you more information without seeing the vehicle, and wiring diagram for the circuit. Usually, things that go on and off when hitting bumps are connection/wiring problems. The fact that one of your low beam headlamps burnt supports this theory. Bad connections or wiring mean lower voltage, thus higher amperage at the bulb, motor or whatever it's running, which makes them burn a lot quicker.
SOURCE: 2000 GMC JImmy headlights quit working
Check for 40 amp fuse in vehicle but most likely under hood.
SOURCE: I have a 04 Envoy and the day-time/low beam lights won't turn on
hi beam/lo beam/DRL may be on separate fuses. Check your DRL (Day Running Lite) fuse
SOURCE: Low beams don't work; High beams fine. Not the
some have fuse under hood for high beams & low beams,,if ok,,u mite need a high & low beam switch,,,,
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Hey i found my problem !!!!!!!
both headlight had blown with-in seconds of each other. I replaced both lights and all is good. I had the electrical system checked for a voltage spike from the regulator, Everything checked good. I ran the truck 3 time with lights on, 1st for 15 min, secound for 30 & the last from 30-45 min. and all seems to be fine. I did stop at a local shop & they told me a volt spike is common on GM trucks blowing the lights out. He ran a complete test, found nothing wrong, maybe just the lights since i have never changed them in 10 years.
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