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No volts from alternator to battery in 83 cad fleetwood 4.1l

Ive gotten 2 new batterys and 2 new 100a alternators but i still dont get 13.0 to 14.0 volts when car is on most i get is around 12.50 just idling. checked voltage from alternator and battery both the same. belt looks good. replaced wire to alternator to battery just because.

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The belt could be slipping. Is the thick red wire hooked up at the alternator it should run from the alternator to the battery. Check voltage at the stud where the thick wire comes off the alternator if its not reading high 13's or low 14 volts your alternator is bad. I've gotten multiple brand new rebuilt alternators that were bad from the get go.

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