Warranty means nothing when it's your wasted time repetedly pulling and installing junk alternators. Local rebuilders use better parts than the cheap crap the stores push over the shelf. Your choices are: junk with warranty or quality without. If you have an original alternator it's best to keep and rebuild.
Okay so what if he does a rebuild and my alternator goes again a few months after? I'd just have to go back again or buy a new alternator. That's the only reason I wanted to get one with a warranty. But if everyone suggests a rebuild I'll call them tomorrow
Don't see folks who go local end up unhappy, see plenty of "lifetime" alternators not work right out of the box.
You'll get honest answers & a good product locally, could be told it's OK ranging to it's so trashed they'll set you up with a replacement that's solid. In between is the more common fix that's cheaper than buying a rebuilt & will last longer.
The Autozone, O'reilly and Napa alternators and starters are a 50/50 proposition; either they are good or bad. Never buy the "economy grade" parts that have either the 90day to 1 year warranty, the repair quality borders on slip shod, its greatly improved on the "premium" lines. Though they don't like to do it, have them test the replacement unit you are buying out of the box... It will be either good or bad and sometimes you can even hear the bearing going bad over the motor noise of the tester. Local rebuilders are almost always better, but more costly than chain store replacement units... chain store units are repaired mainly in Mexico where labour is less, shipping is the main cost in many cases. Local labour in the San Francisco area is about $75 for electrical service... so repairing your unit is usually far more expensive.