battery light - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 06-19-2014, 05:26 AM Thread Starter
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battery light

my battery light flickers on and off. Then it won't come on for a couple of days. I took readings on the batteries.
Truck off - 11 volts
Truck running- 12 volts
Truck running with a/c & radio on -14 volts

I believe the batteries are good with these readings, but not sure. What else can I look for?
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post #2 of 3 Old 06-19-2014, 05:50 AM
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Your alternator is probably starting to go.

Sent from App

2002 F350 CCLB DRW
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post #3 of 3 Old 06-19-2014, 06:12 AM Rookie
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Just had the same problem. when the battery light was on one of the wires coming off the top of the alternator was only putting out 1.7V. New alternator fixed the problem.
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