I can not keep an alternator in my car. I have gone through 6 alternators in the last 8 months. I am getting the life time alternators from Autozone. Are these just crap? Everyone that I get, when I put it on, it charges o.k 13.8-14v then, within minutes it goes down to about 13-13.5v, and gets less and less over a few weeks. Revving the engine does not help output. is this a voltage regulator problem? I am NOT putting another AZ alternator on. If this one goes bad I am headed to NAPA.

AZ has the worst alts in the world, bar none.

If you don't change the battery at the same time, you can get trapped in a vicious cycle. A weak batter can over-stress an alternator, and a weak alternator can weaken a batter. You go round and round if you don't replace them together.

Replace the battery and get an alternator from www.mralternator.com
We have several of his alts running here VERY well. Including my own. You can get them in various outputs. Mine'* a 160amp. Your stocker, and AZ alts are probably 125amp, possibly 105.

Please put your year and trim level in your signature so it'* easier to answer your posts. We need to know what you drive, and what modifications you have.

How is that?

Very Good.

also there are a few including me that are running a AC Delco lifetime warrenty 140 amp, from Advance, I recommed this Alt to everyone