Need Help on X stalling?

[eurogreek1]

I live in Colorado and just switched to my winter tires yesterday. When I picked up the X, it wouldn't start. I thought that they left the trunk open but didn't think twice after it was jumped. Later that night, went out and it wouldn't start again. Make a long story short, it didn't start again today so someone told me to go to Batteries Plus to check my battery before I buy a new one. I went and the guy checked my battery but right away, he said that my alternator was not working right. He said that it was pulling 11.1 and it should be pulling 13.1-13.3. I couldn't believe it so I would like to know if that is what the problem is. I have not changed my battery in a few years but I never expected the guy to say it was the alternator. Any advise would be great!

[yeowzer]

What year? Is it still under warranty?

[noncom23]

Yes. If alt failing will not charge the battery.

[The Cleaner]

How many miles on your truck? and what engine. The 3.0 and 4.4 have a couple different situations that happen to cause a Alternator failure. Generally the Alternators go for a very long time on the 3.0 engines if you keep ATF out of them from the power steering that is filled right above the alternator. Changing out the brushes/voltage regulator is usually all that is needed on a high mile unit, unless it’s squeaking.

The 4.4 does seem to suffer from earlier than expected Alternator failure (IMO). I think using that MEGA expensive water cooled alternator did not produce the same reliability as a standard air cooled unit.

[China Man]

but if it was an alternator problem wouldn't the battery icon light up on the dashboard?