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There is a 2.5" connector just in front of the shifter that has a large, multi-pin connector in it where the STE/ICE diagnostic set plugs into the vehicle. The pins in the connector are lettered and the S & T pins are just 2 of the pins in that connector. If you jumper them then the truck will...

There are a number of battery warmers out there made specifically for auto and truck batteries that plug into 110 volt sockets. There's even one that's a standard GM OEM part...

Take a good look at all of your battery cables and make sure you don't have a loose or corroded connection somewhere. That connection in the transmission tunnel gets a lot of crap and corrosion especially in cold areas like Maryland. That would explain why your batteries look good but won't...