SOURCE: 2000 pontiac sunfire
I had the same problem. Goodwrench looked at my car for 2 hours could not figure it out. Then they unpluged the body control module and plugged it back in and presto, problem solved.
SOURCE: 04 pontiac sunfire battery light and panel lights dim
sounds like your alternator. if you have a multimeter then turn on your car and turn your headlights on/ac and heater fan on high/wipers on and blinkers on. once they are all on hook the meter to the battery and if it reads less then 14 volts then the alt is bad. or you can just take it to a shop and have it tested.
SOURCE: 2000 Sunfire
Check your battery cable connections on the battery, starter, and ground. Might be dirty loose or damaged.
SOURCE: brighten headlamp lense
Polishing the lenses is a temporary fix and doesnt last long, and then its worse than it was to begin with. You can try with some plastic polish and get them the best you can or replace the headlights, There are several companies on the net that you can purchase lights from, just google Cadillac Headlights and shop around. .Make sure they are dim because of the lens and not an electrical problem.
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it does sound like a ground issue, but maybe other problems too. Check the connector to the cluster for tightness. Problem may be in the body control module, but I don't know where that is on your car. Cannot explain headlights getting brighter when brakes applied.
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