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Join Date: Oct 2007
Posts: 3
2002 325i alternator replacement

I currently own a 2002 325i sedan. The wife came home last night and the car was whistling. I drove it to work last night and it continued to whistle. on the way home this morning, the whistle stopped and the battery light came on. I checked the charging system. and there seems to be no output from the alternator (the volts stayed with the car off and running.) I`m assuming that it`s the alternator. How hard is it to replace the alternator? I just bought the car and I really don`t have $$ for the 85.00 service manual on Any help would be much appreciated....Thanks....Tom

Last edited by machinst69; 10-19-2007 at 04:54 AM.. Reason: needed to add a word
Old 10-19-2007, 04:54 AM
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Jeron's Avatar
Join Date: Feb 2004
Location: DFW (Hurst), Texas
Posts: 4,730
Could also be the voltage regulator which I believe is mounted inside the alternator. I would take the alternator off and take it to an auto parts store that can test it.

You can buy Wayne's 101 Projects book for $22. It covers E30 and E36 but many projects are exactly the same for E46's too.

Here is the book:

Here is the article on alternators from the book:
HPDE Instructor (BMW / PCA / Apex)
Here: 1997 M3/4 Byzanz/Magma ~ 2006 Yamaha R6 ~ 1997 R1100RT ~ 1991 Ford F-150 5.8l ~ 2015 Kia Optima
Gone: 2001 330i Silver/Grey ~ 98 Camry V6 ~ 97 Camry I4 ~ 97 Mazda 626 I4 ~ 93 Sentra SE-R ~ 88 Toyota Truck I4
Old 10-19-2007, 06:57 AM
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Join Date: Oct 2007
Posts: 3
Thank you

Thanx for the info Jeron. It was actually the alternator that was bad.
Old 10-20-2007, 10:29 AM
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