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Alternator testing: Autozone Fails; O'Reilly Passes

  • Thread starter Thread starter TheUser
  • Start date Start date Feb 18, 2012
T

TheUser

Active Member
Jul 25, 2003
1,859
1
36
Springfield, MO
Feb 18, 2012
#1
  • Feb 18, 2012
  • #1
2000 Mustang GT alternator. Sold the car for salvage and kept some parts off of it to resell.

I drove the car a total of about 4 miles before it broke, but I do not remember the battery light coming on. I have no reason to believe the alternator is bad, but wanted to have it tested before I sell it.

I've went to 2 autozone stores and it fails at both of them (two times at one store and one time at another).

I've went to 2 O'Reilly Auto Parts stores and it passes at both of them.

I mentioned this to the guy at the last Autozone store and he made a comment that the machines are the same exact machine (and made it sound like I was lying to him).

Not trying to start anything, just wondering why the stores would differ and is there another way I can test it? I don't want to sell a bad alternator, but I don't want to junk a good one either.
 

LarsD

Founding Member
Jul 2, 2002
2,680
119
123
Texas
Feb 21, 2012
#2
  • Feb 21, 2012
  • #2
Only answer I can think of is to bolt it up to a car and see the output it makes.
 

Shiroelex

There's nothing worse than aut
Founding Member
Aug 23, 2001
728
1
27
Westland, MI
Feb 25, 2012
#3
  • Feb 25, 2012
  • #3
It fails at Autozone because it's not from a Honda.

All kidding aside, I worked at Autozone for a few years, and the employee training/machine upkeep was nonexistent for those machines. For what it's worth, I had the exact scenario happen with an alternator from a 95 Sable, and it worked fine on the car.
 
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