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Re: 1995 E32o battery drains when parked
Hello, You could have a central locking pump running all the time because you have a failure, (leak} in the system. It could be door lock actuators, trunk lock actuator or gas lid actuator or maybe a pump failure. It's located under the rear seat on the passenger side. You can pull the seat up and check to see if that is the problem.
If you find this information to be correct would you please enter a "fixya" rating. Thanks, Gator241
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Try using a mechanics stethescope (or a dowel sound rod, thumb over end held against your ear) and with the engine running, touch various components. You will hear different sounds, and hopefully be able to isolate the whine.
CAUTION - Work Safe - moving bits can make the sound rod hurt you.
I'd be guessing at an alternator bearing as they whine worse than a puppy on the wrong side of a door.
The alternator would not come into play unless the battery was dead. Could be corrosion inside one of the battery cables, or a blow maxi fuse for the fuse box. Or a bad ground connection. You would need to take a meter or test light and check for power at the starter post, and the major fuses.
yes the alternator can whne it could be a tell tell sign of the bearings going bad or it could be a bad belt if the volts are still good id just keep an eye on it but be prepared to replace it it could lock up with out any warning.
in the morning before you start your car take the gas cap off slowly and listen for pressure escaping... if it does that means your fuel pump is probably good. Also in a quiet parking spot, doors closed, driver window down,seatbelt on, stick the key in turn to half way and listen very closely and you should hear a whinning noise before you turn the key to the full start position...you should hear a whining sound ever so slightly of you fuel pump priming the pressure in the tank...if it does this then its working also.