1985 mustang electrical problems? - Mustang Evolution

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Old 12-10-2011, 08:30 PM   #1
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1985 mustang electrical problems?

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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Old 12-10-2011, 08:42 PM   #2
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1985 mustang electrical problems?

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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Old 12-10-2011, 09:16 PM   #3
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1985 mustang electrical problems?

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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Old 12-10-2011, 09:32 PM   #4
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1985 mustang electrical problems?

Replace the alternator.
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Old 12-10-2011, 09:38 PM   #5
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1985 mustang electrical problems?

alternator is failing, could be due to worn brushes but who rebuilds them any more? ( i do)
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Old 12-10-2011, 10:23 PM   #6
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1985 mustang electrical problems?

possible weak alternator.
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