Chevrolet Alternator Not Charging

CHEVROLET
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TFREDLEG
  • MEMBER
  • 1 POST
my gadge indicates it is not charging put in new alternater and same thing old alt found to be good we have found no fuses blown is there a sensor or fuseable link that could be causeing this problem
Dec 10, 2006 at 6:04 PM
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GARFIELD
  • ✓Experienced Mechanic
  • 197 POSTS
Using a ohmmeter, connect the positive lead to the battery post(the bolted wire on the back of your alternator) to the positive lead on your battery. Set the meter to read resistance and you should read almost 0 ohms resistance between the alternator and the batteries postive lead. If you don't have your fusible link, fuse or damaged wiring. I had a similar problem with a 280 ZX that I had come to find out the previous owner had replaced the wiring an did a poor job of installing the new wiring, after I replace the wiring my problem went away. Hope this helps.
Dec 10, 2006 at 9:16 PM
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Suggested Repair

Measure resistance between the alternator output stud and the battery positive post; it should be nearly 0 ohms. If it is higher, inspect the fusible link, related fuses, and wiring between the alternator and battery for damage or a poor connection.

Conversation Summary

The owner reports that the gauge shows the system is not charging. A replacement alternator did not help, the original alternator tested good, and no blown fuses were found. The expert advises checking for nearly zero resistance between the alternator output and battery positive; higher resistance indicates a fusible link, fuse, or damaged wiring.

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