No crank or start

I bought this vehicle for $100.00 from some kid at work. It was having a lot of issues and he was just done dealing with it. When I bought it from him it was because the fuel line was leaking and he could not figure out where from. I found the leak with in minutes and just bought a new line and replaced it from the tank to the fuel filter. Went to start the truck and I had to jump start it due to a bad battery. I finally went out and bought a new battery, put it in, went to fire it up and it would not even turn over. Nothing at all, no sound or anything. All the lights come on in the truck but no start, so I figured it was the starter. Took the starter off, had it tested and it actually blew the breakers for the stores back room. Got home with the new starter (after having them test three times while I was there) and got that installed. Still no crank or anything but all lights work. Figured it might be the positive cable running down to the starter since it looked like junk so I replaced that, still nothing. Tried to do a reset on the computer to see if maybe a security code got stuck for some reason, but that still did not do anything. I am at a complete loss right now so any help would be appreciated.

Thank you.