how long does an alternator last? on 2005 Ford F-150

I was traveling on the freeway and heard a grinding sound and thought something was dragging. I stopped and everything underneath was okay, but then my car wouldn't start and no power to windows etc. I think it is the alternator, how long do they last?

by in Mckinleyville, CA on May 30, 2011
1 answer
ANSWER by on May 31, 2011
An hour to the life of the vehicle. How's that for a range? I'm not being funny either - I mean that you could have a faulty alternator out of the box, or you could never need one ever. If this is the original alternator in your 2005 truck, 6 years is not unreasonable. I would strongly recommend a high quality rebuilt unit (like from Ford) to replace the one you have.