Low output of alternator

1988 CHEVROLET BERETTA
71,000 MILES
Avatar
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 10:13 AM
Advertisement
Avatar
JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
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 10:37 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.