This winter my battery started running out of power if I left the car sitting for a day. As long as I drove the car the battery would have enough power, but if left sitting for a day it would not start, 2 days and the battery would be totally dead.

I took it to the dealer who could not figure it out, they replaced the battery and told me to come back if it still discharged. They said the alternator and charging system checked out OK. Of course it kept doing the same thing.

I took it to my independent shop and he checked for a draw, which he found. He said it was about a 4.5V draw. He did pull the fuses one by one and said he found no problems, including the radio. He checked the alternator and the charging system and they were OK. I do have an aftermarket radio, but this was installed over 2 years ago and has never given me a problem. He did check for any dummy lights, etc. that might stay on when the car is off.

His best guess is something that is not fused such as a lock deicer or a side mirror heater. I am bringing it back to him this week for more diagnosis. I also asked him to take a good look at the positive battery cable for corrosion or grounding.

Basically both the dealer and my indie are completely baffled by this. Does anyone have any kind of suggestions or experience with this? I am going to have to put one of those battery buddies in, but I really would prefer not to and to have the car run the way its supposed to.

Thanx much.

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2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special

Sure would help to know what car, but if it is the 96 SL you might want to see if the network shuts down. I don't think it has a body network in 96 but it does have CAN and all the controllers are hooked to battery power.

See: http://www.babcox.com/editorial/ic/ic030538.htm

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Thanx much! It is the 96 SL500. I will pass this link on to my indie.

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2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special