Z4 M battery problem
Posted: Sat Mar 04, 2023 1:13 am
I own a really nice 2007 Z4 M coupe in Connecticut (only 41K miles) . I have had no issues with it in over 2 years, except that my Battery Tender never turns all green, and the battery slowly discharges during winter storage. I am attempting to run a parasitic drain test on the electrical system with an ohmmeter. I cannot find a way to insure that the passenger side door light switch is disabled. Where is the door switch? Also, any suggestions as to the most likely cause of the drain. The battery is less than 3 years old, and quickly re-charges with a 12 volt charger.
result!