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Old 12-05-2012, 07:53 PM   #5
Zchild
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Join Date: Mar 2006
Location: Columbia, Maryland
Posts: 1,811
My Ride: 2000 BMW 3XXi ZSP
Cool

Quote:
Originally Posted by lcoleman View Post
There is no need for a shop for this. If he gets it running again (say, by bump-starting it), he can check the hidden menu for voltage to verify the alternator is working. The alternator doesn't effect starting anyway, so a full charge or jump rules that out, at least for now.
When my alternator failed my bimmer wouldn't start because when the battery depleted there was no juice to crank the starter.

Fasle. If the switch never contacts the "crank" position, there will be no signal sent to the starter. Cranking = working ign switch...not to say they can't fail intermittently.
When my ignition was failing my bimmer would start every 5th time I tried to start it...

This is also false. Often nothing happens, or there is just a buzzing noise like he describes. Cranking = working starter...not to say they can't fail intermittently.
If the starter failed the car would crank and not start... The starter failing wouldn't kill the battery; clearly something is draining the battery...

OP, do the dash/headlights dim when you try to crank it?
IMO; you can't rule out anything because all things are probable...
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