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When I hook up the battery terminals the truck will start cranking over and won't stop even if the keys aren't in it the only way to stop it is to disconnect the battery
It could also be your flywheel or starter getting stuck does it sound like a grinding noise? I had a truck that would do this & I simply skipped/jumped a tooth/grain or so on flywheel & never did it again.
He stated when he hooks the battery up to the cables it does this. That means he either had the ignition wire on the battery side or its bridged somehow .
Also..Check the starter cable I had a similar issue once & it turned out that my positive cable was touching ground or vise versa don't really remember!