'86 325E 5spd. I've researched this a little bit but it doesn't seem like it's always the same problem with all the people who post about it. I am planning on just installing a toggle switch in the trunk next to the battery since it'll be more of a weekend road trip/AutoX car but if there is anyone with a strong opinion about what to chase, I'm all ears. Thanks for any input.
Fully charge the battery and have it tested. A defective battery can die after a couple days.
Also you can check for a small draw on the battery with even the cheapest of voltmeters if it has an amp function.
If the battery is good then you need to hook the ammeter in line with the battery and pull fuses until the load is gone. Once you isolate the circuit with the load you can isolate the draw. Be sure your dome lights, trunk lights and hood lights are OFF when testing for a draw.
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