Tow Truck drivers tip: Smack the @#$#% out of it with a hammer. Have someone try to crank it while you hit the starter with a hammer, rock, crowbar, your head, etc. Often times you can knock it back into working enough to start the truck. After starting it though, do NOT turn it off until you get where you want to be, It may never come back to life again. I once used this trick to get a ladys car running, and despite me telling her to drive it right to a mechanic and not turn it off, she had to turn the car off "just to see if it would start again." It didn't, and I ended up towing her and charging per mile, as opposed to just the flat rate if she had just left it running!