Replaced one on a kenworth this weekend...the inside of the cable was corroded...outside looked fine...that stuff will creep all around in there. You have to cut the wire back until it stops...then put your connector on.
I would also try a different battery...maybe the one off your vehicle...see if it does the same thing.
"But if serving the Lord seems undesirable to you, then choose for yourselves this day whom you will serve, whether the gods your ancestors served beyond the Euphrates, or the gods of the Amorites, in whose land you are living. But as for me and my household, we will serve the Lord.” Joshua 25:15