When i leave my car parked and off for more than a month i often have to charge/replace the battery. However when i disconnect the battery it somehow lasts way longer. I cant think of anything that is on all the time when my car is parked (no alarms, remotes)
You need a multimeter in-line reading DC milliamperes. If you get a current reading, Disconnect one fuse at a time until it goes away. This is the circuit with your parasitic drain
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