1988 Buick Regal alternator

1988 BUICK REGAL
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LILJONNRGC
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Electrical problem
1988 Buick Regal 6 cyl Front Wheel Drive Automatic

In test says alternator is bad, but I took it out and had it tested and they said it was good. In vehicle test says its only putting out maybe 13 volts, but out it puts out fine I am way confused any help would be appreciated.
Mar 24, 2009 at 9:02 PM
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ZACKMAN
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https://www.2carpros.com/forum/automotive_pictures/55316_88regalalt_1.jpg

First of, check the fuses (circled). With a voltmeter and the engine running, check voltage at the alternator B+ port and ground. Record voltage. Your alternator should have about 14 volts. If it is less than 13.0 volts, your alternator is bad. Check voltage at the battery. Compare voltage with alternator voltage. If you have more than 0.2 volts loss, check the fusible link, and break in the wiring circuit.
Mar 25, 2009 at 12:30 AM