It sounds like the alternator is the problem. Have you checked it? If you have a volt meter, here is a how to for checking it:
https://www.2carpros.com/how_to/how_to_test_alternator.htm
If you can't do it yourself, fully recharge the battery and take it to a parts store. THey can check it in the truck. If you don't feel comfortable driving it, remove the alt and have a parts store bench test it for you.
Let me know what you find, but that is what it sounds like.
Joe
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Thursday, December 3rd, 2009 AT 10:17 PM