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Battery light

(1999 Ford F-350 Super Duty)
in Coffeyville, KS on December 17, 2011
my battery light is on on my dash,,the gauge shows its charging,but the light is on.when I unplug the 2 wire pigtail on the alt. the light goes off what the helll
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on December 17, 2011
What is the battery voltage at the battery/batteries, assuming it is a diesel engine.
You have to have 13.5 to 14.5 volts at least. I'm assuming you mean a plug at the alternator. Not a wise move at all.
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