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Aternator overcharging

kb9nqd's Avatar
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03-17-02, 09:37 AM   #1  
Aternator overcharging

Have 92 Ford Aerostar 3.0, alternator light came on 2 weeks ago then went out. Several days later battery was dead and vehicle would not start. Bought new battery and all was fine until last night. Alternator/battery idiot light came on, alternator guage showed overcharging. After shutting vehicle off and letting it sit light still comes on and guage gradually creeps up to overcharging. Assume I need new alternator or could it be the voltage regulator?? Need transportaion for tomorrow for work HELP!!!

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03-17-02, 11:16 AM   #2  
On some Fords, the regulator is internal to the alternator and would be replaced as a unit.

In this case, I'd suggest changing both items to avoid trouble. Ford regulators of the external type are pesky. Reasonable cost item, replace it first and then go to the alternator if it doesn't stop overcharging.

Also check the output with a digital meter, do not rely on the dash gauge.

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