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  #11  
Old 12-19-2017, 08:39 PM
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I had same exact issue on my X. It turned out to be a faulty alternator voltage regulator. I changed it out myself. Haven’t had any issues since. Easy fix once you get the alternator out.
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  #12  
Old 12-20-2017, 01:52 AM
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VR are $40-90 usually and crazy simple to replace.


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Old 12-20-2017, 04:11 AM
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Still a pain compared to the Mercedes we have. I can change the vr/brushes module on it just by crawling under the front of the car. I don't even have to take the alternator off. Just unbolt the regulator from the back and slide the old one out and the new one in.

Takes about 5 minutes.

BMW you have to remove the alternator basically to get to it.
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  #14  
Old 12-20-2017, 02:45 PM
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I was going to work out swapping VR without removal then I realized I wanted to change the slip rings also so I didn't work out the process but it seems doable. It's a very tight squeeze getting the alt out/in but take off all the airbox related parts and it's reasonable.


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Old 12-22-2017, 10:23 PM
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- 1983 BMW 735i (E23), alternator went out at 15y/115K time.
- My current 1998 528i with 170K, the alternator is still stock.

There are basically 3 modes of failure for most people with 50-50 city-highway driving (100% highway driving is better):

1. The bearings (especially the front bearing b/c it handles the load from the serpentine belt) usually go out at 160K-240K range, who knows...

2. The brushes/slip rings wear out at 180K or so. Bimmerfest has a whole bunch of photos of rebuild.

3. Voltage Regulator, this part can go out any time, anywhere from 30K (rare) to 240K. This part is completely unpredictable.

I used to do rebuild simply b/c the re-mfg alternators from local parts stores are no good. The rebuild includes: new bearings, brushes, slip rings and VR.

Lately, Bosch releases a BRAND-NEW alternator for M52, M4 engines...about $200 or so. The Bosch PN is AL0703N (the "N" stands for new, stay away from "X", which is rebuilt).
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Old 12-23-2017, 01:37 AM
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Wow $200 fantastic


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