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      08-15-2017, 12:14 AM   #1
Z K
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Replace voltage regulator?

Has anyone replaced the voltage regulator on the alternator?

I got a code 5DF7 and D373 which points to a bad voltage regulator.

They do sell the part separately so there is no need for a whole alternator.

I see a DIY for the alternator replacement but nothing for the voltage regulator. I was wondering if it is easier to just replace the voltage regulator than the whole alternator on the M3?

From the S85 M5 forums, it is a 30 min job on their cars. Is it as easy for ours?

http://www.m5board.com/vbulletin/e60...ernator-2.html
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      08-15-2017, 06:58 PM   #2
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Most people aren't aware of this option and end up replacing the whole alternator, so good for you for thinking outside the box.

Yes it's that easy. Same process since the alternator is almost identical. It's very straight forward, just be aware of the brushes in the regulator (that diy called them teeth). Don't let them pop out or you'll have a heck of a time getting the regulator assembly over the commutator. Good luck!
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      08-18-2019, 01:20 AM   #3
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Quote:
Originally Posted by deansbimmer View Post
Most people aren't aware of this option and end up replacing the whole alternator, so good for you for thinking outside the box.

Yes it's that easy. Same process since the alternator is almost identical. It's very straight forward, just be aware of the brushes in the regulator (that diy called them teeth). Don't let them pop out or you'll have a heck of a time getting the regulator assembly over the commutator. Good luck!
Bumping an old thread, but is the the correct regulator? I'm replacing mine very soon. Thanks
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      08-19-2019, 09:08 AM   #4
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Yes thats it.
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      08-20-2019, 07:12 PM   #5
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Yes thats it.
Thank you so much! Just ordered and should be able to work on this over the weekend.


Has any seen any useful DIYs with pics accessing the E9X alternator? I've been searching for 2 days and only found the M5-specific thread posted above. If it's virtually the same I'll just use that one.
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      08-20-2019, 07:35 PM   #6
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I am not sure you can get to the regulator without unbolting the alternator and moving it towards the radiator. Assuming that is true, here is a DIY covering that:

https://www.m3post.com/forums/showthread.php?t=1180343

One person in the thread had success replacing just the regulator. Most of us replaced the alternator.

Check your oil pan to frame rail ground cable on the drivers side near the header collector. They are known to rot and become ineffective.
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      08-20-2019, 09:44 PM   #7
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Quote:
Originally Posted by pbonsalb View Post
I am not sure you can get to the regulator without unbolting the alternator and moving it towards the radiator. Assuming that is true, here is a DIY covering that:

https://www.m3post.com/forums/showthread.php?t=1180343

One person in the thread had success replacing just the regulator. Most of us replaced the alternator.

Check your oil pan to frame rail ground cable on the drivers side near the header collector. They are known to rot and become ineffective.
Thanks for the info!
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      08-25-2019, 04:21 PM   #8
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Quote:
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Yes thats it.
The new regulator looks like it has only one brush whereas my old regulator has 2 brushes. Will this be a problem?

Thanks
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      08-25-2019, 07:45 PM   #9
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Quote:
Originally Posted by RedScytheM3 View Post
Quote:
Originally Posted by deansbimmer View Post
Yes thats it.
The new regulator looks like it has only one brush whereas my old regulator has 2 brushes. Will this be a problem?

Thanks
The brushes need to be retracted or you can't install it over the commutator.

That's also part of the difficulty with trying to install a used one. You can't easily pull the brushes back enough to install the part.
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      08-25-2019, 08:34 PM   #10
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Quote:
Originally Posted by deansbimmer View Post
Quote:
Originally Posted by RedScytheM3 View Post
Quote:
Originally Posted by deansbimmer View Post
Yes thats it.
The new regulator looks like it has only one brush whereas my old regulator has 2 brushes. Will this be a problem?

Thanks
The brushes need to be retracted or you can't install it over the commutator.

That's also part of the difficulty with trying to install a used one. You can't easily pull the brushes back enough to install the part.
Yes, I didn't eject the brush on the new regulator. The new regulator appears to only have 1 brush though, whereas the old one I pulled off my alternator has 2 brushes. Does the new regulator need to have 2 brushes to work?
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      08-26-2019, 10:06 PM   #11
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Quote:
Originally Posted by RedScytheM3 View Post
Yes, I didn't eject the brush on the new regulator. The new regulator appears to only have 1 brush though, whereas the old one I pulled off my alternator has 2 brushes. Does the new regulator need to have 2 brushes to work?
No, not as long as the brush(es) are located in the same plane with the comm. If they were 180* apart then there would be a problem. If you ordered the correct PN as above then you should be fine.
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