Advance Auto has an alternator with a lifetime warranty. I replaced mine
under this warrantly at least once. Pretty good deal. GM alternators
fail (in my experience) somewhere about
80K to 100K although I had one failure at 24K and one failure at
50K. The replacement alternators from Advance have lasted about
90 and 110K respectively (before disposing of the cars)...and I
currently have one that has about 30K on it without any problems.
Again..I suggest getting the one with the lifetime warranty as
Advance Auto will honor this warranty without question !!
This failure rate is not the norm by any means. I have one on a 89
burb I bought new that is original except for rear bearing that I
replaced around 120K. It now has 172K on it. I have a 25 year J20 with
a GM alt from factory that has not been off the truck for over 15
years and when it was it was to change the stator for more output
since it was a plow truck. It still works. Alts that fail earlier
these days I feel are more from high under hood temps than anything
else because some of the engine compartments are packed pretty tight
and alts can get hot in them too.
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