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Truck won't start after battery light came on
A few days before Christmas, my battery light came on after I started the truck. After driving for a few miles, the light went out. This happened a couple more times that day and then I didn't drive it for about a week.
This morning, the battery light came on like before, but it stayed on (for about 30 minutes until I got home). The truck ran fine. This afternoon, the truck won't start. It doesn't crank at all. The first time it sounded like it was going to try to crank, but the engine didn't turn at all.
My first suspect is the alternator but it seems kind of surprising to me that I would go from starting it three times this morning to now where it won't even crank. Is there an easy way to isolate the problem to a battery or the alternator (or any other suspects)?
I'm stuck at home now with no wheels. I put an alternator on hold at Autozone and I should be able to get a ride to pick it up tonight but I'd like to avoid that if I can rule out the alternator beforehand.
Truck is a 2002 F-350 with 7.3 and single alternator.
Thanks in advance for any pointers,