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#1
12-28-2015, 03:27 PM
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Alternator rebuild issues
The alternator in my 2002 4.4 went out late this summer. I occassonally use either of the X5's, so I was in no rush to get it back on road. I removed the alternator and sent it to a local shop that I have my starters, alternators, and other items rebuilt at. When I picked it up they told me that the positive diodes where all bad and that they replaced all of the other ones also as well as a complete rebuild. It was bench tested and checked out good. I installed it and only put a couple hundred miles on it until three weeks ago when I wanted to go on a road trip. The battery light came on again before I made it out of the driveway. I ended up having to take the E46 and parking the X5. Turns out the positive diodes were shot again. The battery is shorting straight to ground through the alternator diodes. With the positive cable disconnected from the alternator there is no short, it is isolated to the alternator. This is the second rebuild, as a precaution I am installing a new battery to prevent the alternator from over charging. Since I don't drive it very often I have to throw a battery charger on it every now and then, so the true health of my battery is in question. Fingers crossed that this will take care of the issue. Keep you updated.
__________________
72 E3 Bavaria 3.0 4 spd-sold 76 2002 4 spd project 85 E24 635CSi 5 spd-son's 86 E28 535i 5 spd-sold 88 E28 535i 5 spd-son's 91 E34 525i 5 spd-sold 92 E34 525i 5 spd-sold 95 E34 525i 5 spd-sold 99 E39 540i 6 spd-son's 01 E46 325i 5 spd 01 E46 325Xi 5 spd 01 E53 X5 3.0 5 spd 02 E53 X5 4.4 AT 06 E90 330i 6MT 07 E86 Z4 3.0si coupe 
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#2
02-27-2016, 10:04 AM
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**update**
It's been a couple of months now and I have put about 1,000 miles on since the repairs. I am confident that the issue is resolved now. I installed a new battery along with the alternator that had the positive diodes replaced again. I think that the battery was the source of all my problems placing a high demand on the alternator until it failed. The battery had been tested and held a full charge, so I didn't think of going back to it as the issue.
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72 E3 Bavaria 3.0 4 spd-sold 76 2002 4 spd project 85 E24 635CSi 5 spd-son's 86 E28 535i 5 spd-sold 88 E28 535i 5 spd-son's 91 E34 525i 5 spd-sold 92 E34 525i 5 spd-sold 95 E34 525i 5 spd-sold 99 E39 540i 6 spd-son's 01 E46 325i 5 spd 01 E46 325Xi 5 spd 01 E53 X5 3.0 5 spd 02 E53 X5 4.4 AT 06 E90 330i 6MT 07 E86 Z4 3.0si coupe
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#3
02-27-2016, 10:37 AM
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why didn't you just get a new or rebuilt one?
__________________
 2006 4.8IS65K MILES PURCHASED 7/13
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#4
02-27-2016, 11:08 AM
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A new or rebuilt alternator?
I did have my alternator rebuilt. It had been completely rebuilt twice, I was pointing out the failed component as the positive diodes. After pricing a "new" one from the dealer and seeing that even those are rebuilt for $600+, I decided to have mine rebuilt.
__________________
72 E3 Bavaria 3.0 4 spd-sold 76 2002 4 spd project 85 E24 635CSi 5 spd-son's 86 E28 535i 5 spd-sold 88 E28 535i 5 spd-son's 91 E34 525i 5 spd-sold 92 E34 525i 5 spd-sold 95 E34 525i 5 spd-sold 99 E39 540i 6 spd-son's 01 E46 325i 5 spd 01 E46 325Xi 5 spd 01 E53 X5 3.0 5 spd 02 E53 X5 4.4 AT 06 E90 330i 6MT 07 E86 Z4 3.0si coupe
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