Thank you for all the replies. To answer a few questions.
The batteries were purchased and installed in August, Motorcraft from the Ford dealer like the ones I took out.
A few weeks ago when I tested the alternator the voltage jumped up to over 14 a couple minutes after I started the truck, and then I turned everything on and still had voltage well up above 13, which was over what the voltage read before I started the truck for that test. Yesterday is was still under 12 volts 10 minutes after I started the truck.
I have checked the drive belt. I should replace that since it is original on a 2004, but from what I can tell it looks good. I need to check the tensioner today. Have not done that. And from what I can tell there is no voltage draw when the truck is off, I tested that a couple weeks ago also.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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