Battery keeps draining out

[32i_guy]

Hello everybody and Merrrrrrry Xmas.
320I, 1993, only 77000 km. I replaced my battery a month ago, and the new keeps draining out if I don't start the car for a day or so. the alternator is definitly charging well. it's only when i don't run the car for over a day or so, is there any common problem for draining battery.

thanks [headbang]

 

[mostwired]

But how do you know if alternator is charging well? Did you turn on headlights, heater, radio full blast, and then measured 14.1 volts at the battery terminal with the engine running? If not - you may have worn out brushes or a malfunctioning voltage regulator in your alternator. Any place that rebuilds alternators can fix these problems for around 40$ to 100$. If your alternator is fine, then something is really draining your battery. If it was a short, you should definitely get a blown fuse somewhere.

 

[f1racer77]

a bad ground somewhere may also be the problem