Electrical Issue - Power Drain

[EDirty325]

Hey guys, the title says it all -__-

I hate hunting electrical issues down, so I want to cover my butt and make sure there aren't any known issues with this before I do so. I replaced the brushes and resistor in the alternator when I bought it last September, and also bought a brand new battery. Since then I had no issues with power whatsoever up until about three weeks ago. When I went to start it I noticed I had no power at all, so I jumped it and it started with no issues. The next day I went to start it again and it had died completely.

Haven't had time to mess with it since then, only to verify that it died again. Does anyone have a good idea where to start? I thought maybe the crappy aftermarket head unit, but before I rip that out I wanted more info. Thanks in advance as always!

[rcsoundn1]

What year and model of car?

[EDirty325]

What year and model of car?

Wow sorry totally blew that one...

1989 325is M20B25 fully stock

Thanks!

[AndrewBird]

Connect an amp meter inline with the battery cable and the battery. Then start pulling fuses one at a time until the measured draw drops. This will narrow down what circuit is creating the draw.

See here:

[EDirty325]

Connect an amp meter inline with the battery cable and the battery. Then start pulling fuses one at a time until the measured draw drops. This will narrow down what circuit is creating the draw.

Awesome help and video reference here man, this is why I love you guys.

I'll give this a shot today, but I'm definitely gonna start with the radio, lighting etc.. Hopefully I won't be pulling fuses for an hour :?

Thanks a lot!

[CorvallisBMW]

Pulling fuses, great idea! I'm going to have to do that myself.