I ordered the genuine Bosch alternator for not even 300 bucks and installed it myself for him still good a year or so later and it was a very easy job
The high rev voltage must be over 14 volts, so if not, then its the alternator. But make sure all connections clean and greased.
Eurovan exhibited similar behavior. Start and run fine until.... engine would lose power. Pull over and would die. Restart would be nothing. Sit for an hour or so and could restart and could get the few miles to home. Next day things could be normal or a repeat of slow down and die. This went on for a couple of weeks. The last fail found the battery to be toast even though only a year old. OK, so new battery. All good for the next few days then the gremlins return. New battery is now no good. Determined the alternator had developed enough play that when warm would start to short creating more heat and more of a short allowing it to eat the battery. New alternator and another new battery and all is and has been good.
At 48K miles I experienced an alternator fail (car was running great at the time).
Get the Bosch, including the warranty from them, and be done.
Bosch has a support site that shows what alternators they recommend for your VIN number. AL20X (65A) and AL172X (65A) are the two Bosch shows. However most of us know the original was a 90A unit AL30X.
13V is normal for a stock Bosch alternator. There are 14V or adjustable voltage regulator available as a replacement.
Im having the same issue with my 08 jetta 2.5, replaced the alternator and voltage regulator because the car battery wasnt charging anymore. Anyways replaced the alternator and then I had a high voltage issue with the regulator
FWIW I bought an oreilly\u2019s remanufactured for my e34 a few years ago. It failed and was replaced twice in two years until I just bought the Bosch from FCP. No issues since.
Alternator and the battery are overpriced 2x (google replacement Varta battery and smth like Bosch alternator for your car on pkwteile or idealo).
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