With both batteries charged, as in being recently run and cranking over the engine normally, disconnect the batteries from the truck, and from each other. Let them sit a day or so. Monitor the charge on them, see if they go down or stay up. Then you'll know if it's batteries or a drain from the electrical system.
A simple test for drain is to use a test light. Be sure everything is off (including the hood light). Let it sit for a few minutes for everything to time out. Disconnect the right battery. Then clip the test light lead to the negative cable. Push the point of the test light firmly into the negative battery post. Carefully remove the negative cable from the battery WITHOUT BREAKING THE TEST LIGHT CONNECTION! If the connection is broken, you'll have to start over to get a good test.
If the light glows dimly, there is normal battery draw. If it glows bright, and there is a noticeable spark when the cable is connected/disconnected to the battery, there is something draining the battery.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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