My Caprice's alternator failed. The car had ~133K on it, and I don't know if it was the original or not. It was the 140-amp model.
I bought a lifetime-warranty Remy 140-amp for $110ish shipped from Rock Auto. https://www.rockauto.com/en/moreinfo...037461&jsn=449
The first one charged fine below 4000RPM, but completely stopped charging above 4K. As in the lights would dim noticeably and voltage would drop into the 12s. Once below 4K, it would begin charging again.
The second one was damaged in shipping and wouldn't spin by hand.
The third one charged all the way to 6K but its output voltage would often (but not always) fluctuate by +/- 1V or more and not do a great job charging the battery. The fluctuations were noticeable as rapid flickering of the dash and headlights as well as being noticeable on a voltmeter.
At this point, Rock Auto offered to let me return it for a refund so I could buy something else. I bought a Duralast Gold from Autozone for $140ish after tax. https://www.autozone.com/batteries-s...07418_222912_0
If you look at the picture, and if you look at the alternator on your B-body, you'll see that neither the top nor the bottom mounting holes are threaded--they're designed to have bolts go through them with a nut on the back end. Well, the top hole on the Duralast alternator was threaded. Not wanting to get a different bolt (why? because REASONS!), I swapped it for another one, which was also threaded.
So, I ordered a fourth Remy from Rock Auto. I figured, surely the third time will be the charm (can't really hold it against them for the one that was damaged in shipping). Alas, no. This one charges fine up to 4K, but from 4K on up, its output goes on and off. Not as fast as the flickering of the third Remy, but I'd say it switches on to off every half second or so.
I really want to not have to pay for another alternator again, ever, which is why I bought the lifetime-warranty Remy and Duralast. I don't trust parts-store alternators to last forever, so when one comes with a 1-year or 2-year warranty, I fully expect I'll be buying another one in a few years.
The Remy is obviously a bust--those jokers apparently are incapable of making a decent alternator. I don't really want to switch to a different bolt so I can use the Duralast. At this point, I have resolved myself to buying a non-lifetime-warranty alternator. What I'm looking for is you guys to recommend me a dead-nuts reliable alternator that'll work great for a long time, even if it has a short warranty. And under $200, please.