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Old July 26th, 2014, 7:35 PM
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Default Help please newbie here

Not new to mechanics but new to the forum, HELLO.


I have a 1997 HD C2500. My problem is that after three Alternators it still doesn't charge. At times it will be charging at 14-15 volts right after start-up but within ten minutes or less the gauge goes back down to battery voltage. It continues to drop as the truck runs off it.


I cannot find any info on tracking down the problems inherent in a '97 that might cause this. Everything else works as it should except the Tach, which hasn't worked since I bought this used truck.


Thank You for any help you can give...
Old July 27th, 2014, 7:44 AM
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when the gauge drops to battery voltage, what is the voltage when measured with a dvom at the battery?
Old July 27th, 2014, 12:49 PM
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