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i have a 1985 mustang, when im driving the headlights are dim but when i give it gas the headlights brighten up. any ideas?
 

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The battery has a weak cell. It hasn't completely died but it cannot hold a charge very well. The alternator compensates due to the increase in revolutions but that's about it. I would have the battery and alternator tested.
 

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The battery is low and the alternator is doing its job or you would not have the lights brighten as engine speed increases.
 
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