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Old 11-20-2019, 12:26 PM
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haigha haigha is offline
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Yesterday it was a little warmer and I saw no problems on a trip across town. Around 14 V right away and steady round trip.

I found this thread which seems to be the problem I'm experiencing, though the OP's mornings were colder (around freezing):

https://www.bimmerfest.com/forums/sh...d.php?t=668157

The solution for him and a couple of others in the thread was replacing the whole alternator, though some suggested just replacing the VR may have solved the issue. Member upallnight is on that thread

One of the useful links is this video of replacing the brushes on the VR and cleaning up the slip rings on a Valeo:

https://youtu.be/aVvPzwtxdrM

I think I'm going to start with buying the VR and replacing. Removing the alternator seems straightforward based on the video I linked to in my previous post here. If the VR doesn't fix it, I'll replace the alternator. Opinions?

Questions:

1. Is there an easy way to disconnect the power to the alternator (remove a fuse, disconnect positive terminal under the hood, etc.), rather than disconnecting the terminals on the battery itself?

2. Realoem shows a different alternator for my 10/03 build than later models:

https://www.realoem.com/bmw/enUS/sho...diagId=12_1244

Do you think the Valeo regulator will fit both? (shows as fitting when I select my vehicle, but it's hard to tell if it fits both the -992 and -994 versions in the last two links below)

https://www.fcpeuro.com/products/bmw...eo-12318510090

The site shows two Valeo alternators that fit for me, but the first one shows up to 12/03, which covers my build:

https://www.fcpeuro.com/products/bmw...li-12317540992

https://www.fcpeuro.com/products/bmw...x5-12317540994

Last edited by haigha; 11-20-2019 at 12:32 PM.
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