A few years ago I worked as a mechanic for a guy that owned a small fleet of Terra-Gators, the 5 wheeled sludge applicators. One of the drivers was going up a hill on a 4 lane highway, 65 MPH speed limit. He said the cab started filling up with smoke and the engine died. He was off to the right as far as he could get, but there was a guard rail there. The toolbar was hanging out in the slow lane about 5 feet when I got there. Most of the wiring was burn out of the dash, ALL of the wiring was burnt on the engine, the starter was melted and the battery cables were burnt off. We made a mad dash to town (about 8 miles), and found a Freightliner dealership that sold Detroit Diesel parts. Armed with a truckload of parts and several rolls of wire we flew back to the machine and started replacing parts. We put the vital stuff on and did some hotwiring and got it to run long enough to get up the hill and completely off the road. That's when the state police showed up and said we better get it fixed and out of there before dark (about 30 minutes away) or there wouldn't be anything left by morning. We managed to get a headlight and flashers working and took off for a nearby farmer we did custom spreading for. It took a couple days getting everything back in shape. I've slept a lot since then, but it seems like there was a short inside the battery box, causing some ground wires to become shorted on power wires,thus frying the electrical system.
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