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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-09-2012, 06:21 PM   #41
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Originally Posted by E46Mango View Post
thanks for the info. it does seem strange how bmw used different alternator plugs for a very small amount of E46s. this means the wiring harness was different along w/ the part. i cant find your voltage regulator anywhere. where did you buy it? Seems its spec'd for the Z4?

Seems these are the part #s:

12317559183 Square plug voltage regulator
12317515319 Round/oval plug voltage regulator
Mango, very observant! You are correct. I got the part from my local BMW dealer. When I told them I needed a voltage regulator (120A) for a Z4, the parts people looked the part accordingly and got my new part.

That's funny... I have my old VR as spares as well
2004 TiAg ///M - 168,447 miles.......................2003 Imola ZHP - 174,394 miles

Last edited by cak323i; 11-09-2012 at 06:24 PM.
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Old 11-09-2012, 06:24 PM   #42
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^Great tip i'm sure this will help someone in the future when they need a voltage regulator with a rounded plug!
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Old 11-09-2012, 06:34 PM   #43
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OK I asked Tock172 if he could check his voltage readout via obc and after sitting 1.5 hours like mine and also with a new battery, his also reads 12.1V. So I think it's normal. I wonder what other peoples obc read? i was already in a panic ready to throw my battery through autozone's front window
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Old 11-10-2012, 03:17 AM   #44
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Noob question.. The only picture I have from my alternator is the one below as it is now buried underneath the s/c snout:

Any way to find out if I have a Valeo or Bosch? Realoem lists both for my model
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Old 11-11-2012, 05:48 AM   #45
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Remove your P.S resevoir,get a cloth and try to wipe off the alt.Look for a tag on the back i think, or on the housing can't remember.Should say what brand, and voltage. Mine does. Valeo 120a 2004 320i
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