Why so many alternators? Are you resetting the battery management system through a scan tool after replacing a battery?
Yup. The battery I bought as a replacement was junk, I bought the cheapest alternator I could buy too. Both contributing factors.
a little history. About 3 months after I got the car I took it to the track. Alternator started whining after 6-7 runs and ignition breaking up on big end of track. Got a few miles towards home when dash wigged out. Long story short, battery trashed and alternator shot. Had original battery, but alternator was clearly changed as it was really beat up from install, and I assumed whoever installed it trashed the bearings by hammering it in.
needed an alternator on a Sunday, so got a used one off craigslist. Picked up a Walmart battery.
was getting bad charging after about a year, so I picked up a TYC off rockauto. Had to swap in a Bosch voltage regulator to keep the computer happy. Last year battery started to not hold charge well, so exchanged it under warranty.
so last Friday launched the car hard and killed the battery and broke the decoupling pulley on the alternator.
when the new alternator comes in I am definitely swapping the alternator pulley to an INA one I have, and already have an AGM battery for it