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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Battery Light Wont Go Away

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Old 04-24-2015, 04:44 PM
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Brandon Harrison
Battery Light Wont Go Away

I have a 1996 F 250. It has the 7.3 PSD in it. I have had a battery light on for years. I read somewhere it could be the ignition switch going bad. I changed it and the battery light never went out. The truck charges fine and the batteries last for years.


Anybody have a clue as to what it could be?
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Old 04-24-2015, 05:47 PM
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Usually that means a failing diode in alternator. Will still charge just not as well. Doesn't explain batteries lasting so long tho.
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Old Yesterday, 10:01 PM
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Brandon Harrison
I have changed the alt since it has been on. Even used a Ford alt for the replacement. Light has been on for 7-8 years.
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Old Today, 05:34 AM
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All that light means is that there is a voltage difference between alternator output and battery voltage. I would measure alt output terminal to case ground and chassis ground as well. Compare this to voltage from battery + to chassis ground and since you have dual batteries do both of them.
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Old Today, 07:58 AM
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Brandon Harrison
Do you think it could be something as simple as a grounding issue?
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Old Today, 08:42 AM
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most likely a bad little plug on the alternator. they get hot and start to melt.
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