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BMW645 Germany
02-05-2012, 11:27 AM
Hello, did someone already changed the alternator or regulator? When I lay under the car it looks very tide. My Voltage always change from 12V to 13.7V very seldom stable. Sometimes I start and drive I read for a while 12V, it is not charging at all. Then suddenly it goes to 13.8 or 14V as like nothing been before.
So I guess the regulator need to change, its the cheaper part, so first try.
In the net I don't find something about the change.
Thanks

Yorgi
02-05-2012, 03:40 PM
If you have access to an oscilloscope you can test the alternator first.
(http://tis.spaghetticoder.org/s/view.pl?1/09/00/06)
Looks like there are two different alternators.

Instructions for alternator 1. (http://tis.spaghetticoder.org/s/view.pl?1/09/68/12)
Instructions for alternator 2. (http://tis.spaghetticoder.org/s/view.pl?1/07/45/83)

Also google for 550i alternator DIYs. They are almost identical.

BMW645 Germany
02-05-2012, 05:25 PM
Hello,

it look like I have alternator 1. So far easy, but the guy wont come out, I could tilt it to the right side but no movement out, something is still holding it. I do it carefully not to break something. For me would be enough to reach the Voltage regulator so I didnīt remove the fan cowl with electric fan. To tilt it later forward to remove the regulator would be enough.