2005 Touring. In Nov. '20 I had my RCM overhauled. I worry that my RCM may have failed again grounding my battery. Of course, it might be a different problem. My battery is completely discharged in 36 hours.

 

Did you get your battery checked?

 

Help will be hard to give with what you posted. Member Bill F has a starting point but be aware many places have idiots for technicians in regards to battery viability. When was the battery installed? Some say replace after 4 years with a quality replacement. IF your battery is 5 or more years old then suspect a test as erroneous if it indicated good. There is a help forum post for a systemic test of system current draw outside of the normal (with a good battery). After you eliminate a bad battery you may wish to familiar yourself with that testing procedure. Good luck!


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There are many potential causes for this kind of battery drain. Following the testing procedure is the best course of action. We are currently experiencing a similar battery drain on our 2004 Limited coupe and have narrowed it down to fuse number 35. The back light for the odometer, clock and temperature stay on continually with the key removed instead of shutting off after 30 seconds as designed. We installed a battery cut off switch on the negative battery terminal as a temporary solution to prevent the battery from draining when not in use but obviously this is not convenient or ideal since memory functions are lost, keyless entry won’t work with the battery disconnected and my wife doesn’t want to go through the process of disconnecting and reconnecting the battery in the parking lot when she wants to take the crossfire to work. Another forum member had a battery drain which was due to a failed heater control unit and for him the drain showed up when testing different fuses. Our issue may lie within The instrument cluster or the heater controls but we have not isolated it yet but plan to pull the instrument cluster when we are done driving the car for the year.

 

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All the troubleshooting in the world will not solve a battery that is past its service life. MAKE SURE the battery is good before you start pulling fuses/checking for excessive current draw. After a good load test shows the battery is good, the next step will be going through the steps to sequentially locate any excessive load where it shouldn't be. I haven't yet heard of anyone having more then one problem component but it is possible (like after a bad spike from, say, a jump-start gone bad). Good luck!


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