You might take off the 2 cables off of the starter & clean the 2 (large/small) terminals with a wire brush then clamp a red jumper cable on both of em and the black jumper cable end to the nearby starter ear then connect the other ends of the jumper cables to your truck battery setting on the ground by the Dr front wheel & see if it cranks. this'd keep the "connection" sparks from messing up the starter threaded studs which it would if you made your last connection at the starter. This'll take the batt/starter/eng lockup out of the way.