Low output of alternator

1988 CHEVROLET BERETTA
71,000 MILES
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KOCHER1
  • MEMBER
  • 1 POST
Battery not charging.With car running I tested the voltage at the battery at 11 volts, so I replaced the alternator & tested it again at 11 volts. So I bench tested both alternators at approx 14 volts. HELP!
Apr 25, 2013 at 3:13 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Check the wiring for alternator and battery, on the vehicle. With the engine running, did you check voltage at alternator bat terminal?

The alternator needs excite voltage or it won't work, usually that is the alternator L terminal. Does the charge lite on the dash work?
Apr 25, 2013 at 3:37 AM
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