[panhead george]

I replaced my alternator 9/2011. The last couple of days, I noticed the voltage (on the scangauge) has been at 12.2to 11.7 Volts.

Question:
How many years (hours, miles ?) average should I be able to get out of an alternator?

The one I have was rebuilt.

Can I check or measure anything else besides the battery wire to the alternator?

What should I measure at the two wire plug in the alternator?

I measured 12.0 vdc to ground at the + terminal on the alternator with the truck running. (Fluke meter)

 

[Maryland dieselnick]

Hi George, sounds shot. Take off and take to be tested at parts store. Bring batteries as well charge and have load tested individually. Try to Get Napa's new not rebuilt with lifetime warranty.

 

[panhead george]

Brought the alternator to a rebuilder. $185.00 plus tax for a new unit.

I was told 120,000 miles is lifespan. Of course that depends on connections, batteries etc.

 

[bugman]

I have seen rebuilt alternators last anywhere from 10 minutes to 10 years 100K+ miles.

Rebuilt ones are a crap shoot unless they are rebuilt right and usually a alternator/starter shop in your local area is best.