Battery Drain source

[dwtesq]

I recently replaced my battery. 6 months ago. However, if I do not start and run the 89 535i for 2 days, I will have to jump it to start it up. Something seems to be draining the battery, any suggestions? :(

[632 Regal]

Bad diode in the alternator or the voltage regulater.

[dwtesq]

Thank you,

I will try to pin it down.