It may just be from the electrical load in the truck then. I regularly have cars come in that measure from 11.9 to 12.3 volts, and have no voltage issues... If you're worried about the battery's ability to hold proper charge, after charging or driving for a while remove the ground terminal to remove the electrical draw of the vehicle, then test across the terminals after letting it sit a few minutes to stabilize. It should have 12.65 at 100% charge, 12.45 would be 75% charge, 12.24 would be 50% charge and so on.

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