Cummins 4BT & Diesel Conversions Forums banner

1 - 4 of 4 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter · #1 · (Edited)
I have a 93 isuzu npr with a 4bd2 engine. The battery light and vaccum light is on. Put a voltmeter on and its not charging (12.0-12.5). I have put a test light on the charging fuse while running and no power. I have changed the charging relay and still the same thing. I have also pulled the the 3 prong plug from the back of the alternator and have power on one when i turn the key on and one when the truck is running. the other has nothing. I have also ran a new battery wire from the back of the alternator to the battery. Any suggestions would be appreciated before i have to make the dreaded trip to the dealer.
 

·
Registered
Joined
·
15 Posts
I had a similar problem. I ended up having the alt rebuilt at an auto electric shop. About $150 opposed to the $400+ for a new/rebuilt... (improved the vac system while they were in there. Pump is on the alt...)
 
1 - 4 of 4 Posts
Top