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General E46 Forum
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Old 08-16-2012, 09:36 PM   #1
spugeddy
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does replacement alternator type matter

I am looking at having to replace my alternator in my 02 325i, and haven't identified which type I have. I am guessing they are interchangable.

90 amp or 120 amp, bosch or valeo. I could go witht the bosch 120 amp even if my original is a valeo 90 amp right?
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Old 08-16-2012, 09:41 PM   #2
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For some reason I seem to recall an issue someone had with the connector not matching up.

Safest is probably to stay with what you have, but someone ought to know whether the connector is by brand or by amperage.

I just looked at alts today, and for my car, they all came up as 120...and I remember seeing what brand mine was but forgot.

You should find out what you have anyway...just clean up the label on it or something. I know it's there somewhere...maybe inspection mirror and flashlight?

Anyway, a bump!
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Old 08-16-2012, 09:42 PM   #3
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Careful, connection to the voltage regulator on the back of the alternator varies. I think the connectors changed in either 02 or 03 when they went to a different ECU.
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Old 08-17-2012, 09:59 AM   #4
richkopena
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The alternators (Valeo and Bosch) were interchangeable on ny 02 330CI. I have also read about different connectors, but I can't get a good reading on when they were different.

It would seem weird to have different connectors for different brands of alternator on the same Production year car. How would you handle that on a production line?
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Old 08-17-2012, 08:56 PM   #5
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Quote:
Originally Posted by richkopena View Post
The alternators (Valeo and Bosch) were interchangeable on ny 02 330CI. I have also read about different connectors, but I can't get a good reading on when they were different.

It would seem weird to have different connectors for different brands of alternator on the same Production year car. How would you handle that on a production line?
There was no big difference between the brands of alternators, it was when they updated the wiring harness at that point between 2002 and 2003. Probably 9/2002, in BMW's typical scheduling. Things like the ignition coils changed completely, and many of the connectors like oxygen sensors, alternator, various intake sensors, etc... changed.
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