Diesel, 125k miles, 1984 blueBird with a 1993 remain CAT 3208T.
After fueling, the bus would not start. Bus finally did start, but the ignition switch was smoking from an electrical fire.
Cause: there was a bare wire near the alternator that caused a spark to jump to the top of the fuel solinoid. This caused the solinoid to burn up and the ignition switch.
Until I could get home, removed fuel solinoid and removed the center from the solinoid. This allowed the engine to start. To turn off the engine, I had to remove the fuel solinoid and push a screw driver into the hole to shut off the fuel to the engine.
I couldn't find an ignition switch and used 2 on-off switches to rig a way to start the engine.
Rod