Headlights and stereo have anything to do with each other?

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April

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I have a 2005 Chevy Trailblazer. I bought it in April and the carfax is clean but I think it's been wrecked. My stereo (when the truck is running) will start to make a loud buzzing sound if a door is shut too hard or if I hit a big bump and then it will only stop once I shut the truck off. I had the ground wire replaced but it's still doing it. Also, my left headlight is much brighter than the right but the left one will flicker like a strobe light when I hit a bump or when i'm driving on a rough road. I know it drives the people driving infront of me crazy. Do my headlights and stereo have anything to do with each other? Do I have a loose wire somewhere? I was told that my headlight just needs a new bulb but I have a feeling that thats not it. What else could it be? Thanks for your help.
 
The buzzing noise could be a specific speaker that has a wire touching the door frame or body of the speaker, it would make sense why this happens when you hit bumps. I would check to make sure the headlight bulb isn't just loose in it's socket, it may just have a sketchy connection and not even need to be replaced, but it could be that the filament is fatigued and wiggly inside the bulb too. I don't think the two are related, unless other things like your dash lights and tail lights do weird stuff when you hit bumps too, then you could have another ground wire somewhere that is loose. Start with the simple stuff like checking your speakers, make sure they are still mounted firmly and that none of the wires are loose, and check your headlamp bulb.
 
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