View Single Post
Old 03-15-2010, 11:31 PM
Baer Baer is offline
Registered User
Join Date: Jul 2008
Location: Maine
Posts: 10
Originally Posted by pimpernell View Post
If I were you, when your finished with the car for the day, disconnect the battery until the next morning. The next day, reconnect the battery, and try and start the car. If it starts, the battery is holding its charge, if it doesn't, you know the battery is suspect. If the battery passes that test, I would recheck the alternator, by disconnecting all the wires attached to it, including the heavy battery cable, put your multi tester in continuity mode, and place one lead of the tester on the alternator battery connection post, and the other lead to the engine block or any ground point. If you get a continuity reading, it means that one or more of the alternator diodes have failed, and is allowing current to flow from your battery to the engine block. I had that happen to my car, and if the battery were left connected, it would totally discharge in a matter of a few hours with the key in the off position.
If it were a bad diode, is this something that can be replaced? Or is a new alternator needed?

Also, I did not realize you cannot touch the multimeter to the two terminals Luckily I did not blow the meter. That is where I was getting the .4A. I need to do some rechecking and report back here.

I have not had a chance to work on the car today, but thank everyone for the replies. I wish Cumminsforum were this helpful for my other diesel!
Reply With Quote