I made a stop yesterday and 04 pitbull would not even click when I tried to start.I tried to push start by myself,no luck ,even less fun.I hauled it home and it started right up. Now nothing again.I cleaned and tightened battery connections and reseated the plug to the piece of crap computer . The dash lights and running lights work but no headlight or blinkers and no start.The second yellow light from the right on the box under the plug is lit. The speedo boots up and I see 49443 before it goes to odometer . Can some one point me in a direction to start checking this?