I would try replacing it with a stock Bosch alternator.
Vehicle:
Volkswagen Jetta
Reviews of Bosch alternator
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Ok so I exchanged the alternator but just got it on this morning and the alternator i exchanged it with was a bosch which is a direct replacement of the original one i have, i hooked it all back up properly, new charge wire and its running at 11.4 volts now and still drops lol.
Cons: voltage still drops
Vehicle:
Volkswagen
Got it. So am I correct in thinking that these Bosch alternators have both diodes to get to DC and voltage regulators to make it a clean voltage?
Vehicle:
Audi TT
Welp... the alternator AND the battery are dead. New battery is in, now to do the alternator but I need food first. I was amazed that the store had a rebuilt Bosch alternator IN STOCK
Pros: Bosch alternator in stock
My 05' Golf TDI came with a Bosch unit from the factory and lasted about 90k or so, I replaced it with a Bosch Reman and its been doing well, 120k now.
Pros: doing well, lasted 120k
Vehicle:
Volkswagen Golf
Mileage: 120000 km
I pulled the alternator to have it tested at o'reillys. Test showed it was dead so I bought a reman'd Bosch, but still needed a jump. Car fired up right away, but the voltage gauge still read low and just slowly dropped until the car died again.
Cons: voltage gauge read low
Vehicle:
Volkswagen
I got an OEM (Bosch) new replacement 120A alternator from German Auto Parts. It came with the pulley installed.
Pros: pulley installed
Vehicle:
Volkswagen
I ended up with a Bosch reman from AutoHausAZ .. was a bit cheaper than europarts-sd.
Pros: bit cheaper
Vehicle:
Audi A6
Funny thing is, the Bosch alt. I had in the car at the time is sitting in the car in my driveway. Okay, I replaced the brush pack a few times. The 90 Amp alt. itself is at least 10 years old, if not more.
Pros: at least 10 years old
Cons: replaced the brush pack
I had a Bosch reman that self-machined itself to pieces in less than a year on my street car - the car that rarely saw more than 5K rpms. The Bosch replacement seemed to work OK but I sold the car shortly thereafter.
Pros: replacement seemed to work
Cons: self-machined itself to pieces
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