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Hello everyone.
This is my first post:
I have a 99 dourango and im having problems with the charging system. My voltage gage keeps droping after 3 to 4 week after i charger the battery. This has been a on going problem for the past 3 months. This what I have done , I have tested the alternator dozen of times and it pass the test, and even had the battery tested and it pass to. I have put a re-man ECM in, thinking it was the ECM. Im out of clues on what or why the battery it dieing after 3 or 4 months. Can anyone help.

 

[Tymont]

I would check to make sure you have good connections on both ends of the positive and ground cables.
It's also possible that you have a broken or worn cable. That's where I would start.

 

[jkelly16]

Welcome to the Z from NC! Glad you joined, enjoy!