1991 Mercury Capri Not Charging

1991 MERCURY CAPRI
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ALIGNMENTDUST
  • MEMBER
  • 3 POSTS
i recently got a 91 capri nonturbo and am having a nightmare trying to figure out what the non charge concern is.
when i got it it had a bad alternator on it and the previous owner put a new alternator on and it wasnt charging so i put a new battery and alternator on it.
i put a new belt on and adjusted it right.
im getting 12 volts with key on but when running i am getting 12.2 at battery terminals. i am not sure if the previous owner had all the connectors to the alternator on when i got it.
any ideas or concerns that have happened to you in the past would be greatly appreciated.
Feb 25, 2007 at 11:20 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
usually if you only get a slight boost in volts the regulator is suspect, but also check the battery cables, and the battery ground to the engine block.
If you put in a rebuilt alternator, you may have got a lemon! I am not sure if your alternator has internal regulator but if yes, try a different one.
Mar 4, 2007 at 7:26 PM

Suggested Repair

Check the battery cables and the battery ground to the engine block. A slight voltage rise often indicates a bad regulator; if the alternator has an internal regulator, try another unit, since a rebuilt alternator may be defective.

Conversation Summary

The owner of a 1991 Mercury Capri non-turbo replaced the battery, alternator, and belt but still measured about 12.2 volts at the battery while running. The expert said a slight voltage increase suggests the regulator and recommended checking the battery cables and engine-block ground. A rebuilt alternator may be defective, so another unit should be tried if it has an internal regulator.

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