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Old 02-19-2013, 03:31 AM   #1
omodos
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alternator voltage regulator confusion

please please advise

Had the Alt voltage regulator swapped out on a 2002 n42

the part number stamped on the old one was
Part Number: F 00M 145 285 apparently cross refs with part number 12317523059 off the realeom site and applies to either 102 or 140a alternators

BUT mechainc replaced with
Part Number: F 00M A45 221 that cross refs with part number 12 31 7 540 656 on real oem site, and this regulator applies to 150a alternators that I don't think the car has


Car is fine so far but anyone know if this is a problem replacing a voltage regulator for use on a 150a alternator and using it on an alternator that has a 120/140w rating?


I asked mechanic and he said this 12 31 7 540 656 is a replacement for the the 12317523059 but I am worried.
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Old 02-19-2013, 07:17 AM   #2
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The way I read that, both are for 140A or 150A (not sure which is correct, but I'm guessing there's only one) alternator, and the part has in fact superceded. I wouldn't worry if you're charging at 13.5-14.5V.
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Old 02-19-2013, 07:38 AM   #3
WDE46
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The most important thing is to get the one that actually fits. There are two versions of the voltage regulator and they have different connectors. If the connector fits your car, then you can use it I believe. Search user E46Mango and voltage regulator. If you can't find the thread, just look at his signature and check through the links. I think one of them has a guide on alternators and voltage regulators.

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Old 02-19-2013, 09:05 AM   #4
omodos
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Quote:
Originally Posted by WDE46 View Post
The most important thing is to get the one that actually fits. There are two versions of the voltage regulator and they have different connectors. If the connector fits your car, then you can use it I believe. Search user E46Mango and voltage regulator. If you can't find the thread, just look at his signature and check through the links. I think one of them has a guide on alternators and voltage regulators.
wde46 and icoleman thanks, the part fits for sure and after 2 days driving no red battery symbol, plus mechanic/electrician told me it is charging battery just fine but by golly did the realoem site throw me, suppose its mechanics fault for not getting me exactly the same part with same part number , anyway again to recap and re-get on everyones nerves here is where i stand IF any other patient e46 owners can confirm if i am ok or not with change to regulator
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Old 02-19-2013, 09:20 AM   #5
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I mean, it says "up to 3/2012"...that's good enough for me. Beyond that, no one Stateside got the n42 so we won't be much help with part numbers.
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Old 02-19-2013, 09:47 AM   #6
omodos
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Originally Posted by lcoleman View Post
I mean, it says "up to 3/2012"...that's good enough for me. Beyond that, no one Stateside got the n42 so we won't be much help with part numbers.
hmmm confused now the one you refer to as saying up to 3/2012 is the one we removed and replaced with the one that had a 150a rating against it
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Old 02-19-2013, 10:22 AM   #7
WDE46
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Oh oops, my informations was based on the M54. IDK if the N42 is different for the alternator, probably is. Didn't notice that you had the N42

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Old 02-19-2013, 10:31 AM   #8
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Originally Posted by omodos View Post
hmmm confused now the one you refer to as saying up to 3/2012 is the one we removed and replaced with the one that had a 150a rating against it
Ignore the rating, they both state plainly that they work in the same alternators. The part number has superceded to the one you have now. It works, quit worrying.
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Old 02-19-2013, 10:32 AM   #9
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hmmm confused now the one you refer to as saying up to 3/2012 is the one we removed and replaced with the one that had a 150a rating against it
Yes, the part number is superceded. Drive the car and don't worry about it.
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Old 02-20-2013, 02:00 AM   #10
omodos
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Yes, the part number is superceded. Drive the car and don't worry about it.
Ok Icoleman thanks
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