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It's most likely that your alternator is bad. Most auto parts stores will check them for free, or you can have your local garage test it. A bad ground probably is not the source of your problem, since the brightness varies with engine RPM. Add a ground strap between the engine and the firewall ans go to bare metal. Most problems like yours are due to bad grounds. Older vehicles had good grounds but sometimes people remove them because they don't think they are important and also as the car gets older, these grounds corrode. check your battery and your charging system. a weak battery/alternator can cause those symptoms.

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Q: What are some possible reasons for the headlights to be dim looking but get brighter when you rev the engine of an 83 Silverado?
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