Hi, we are having this issue with our 2004 Concorde 2.7 liter where the car starts and runs fine for days, then out of no where the battery is dead. I assumed the first time that a light must have been left on or something because it took a boost fine, ran fine, then restarted after being driven for 10 minutes on its own.


Then it worked for a couple of days no problems, but then this morning, dead battery. I am reluctant to change the battery or alternator because it seems weird that they work, it seems more likely to me that something is putting a drain on the battery.


I have read that a voltage regulator can cause these types of isses, does that make sense? Any other ideas?


Thanks!

 

not correct about a voltage regulator its only in use when the car is running.

A battery off draw test would need to be performed to see what circuit is staying on killing the battery.