1980 Vette not charging battery

Old 08-17-2014, 02:07 PM
Junior Member
Thread Starter
Join Date: Aug 2014
Posts: 1
Default 1980 Vette not charging battery

New 120 amp. 3-wire alt., new Optima red top, replaced "main" ground wire, old one corroded to pieces. On start the volt meter only goes to 13 V. and drops as load is added. Checked alt. with digital volt meter and the alt. reads 12.2 V. Any ideas?
dpw21562 is offline  
Old 08-18-2014, 07:13 PM
Senior Member
Join Date: Mar 2014
Posts: 244

Take the new alternator to a Battery Specialist dealer, or the like, and have it tested or put a known good alternator on your can and see if the problem is still there.
BigBlockMark is offline  
Old 08-19-2014, 04:08 AM
Junior Member
Join Date: May 2014
Posts: 18


See the attached photo - check for 12v using a test light or meter on terminal "2" as in the diagram. With the key switched to "on", there should be 12v to energize the field and allow the alternator to charge. With the key "off", there should not be voltage here (or it will drain your battery). Hope this helps...
Attached Images
File Type: jpg
alternator.jpg (10.0 KB, 2 views)
indcontrols is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Contact Us - Manage Preferences - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -