Re: 1991 Thomas School Bus ~ Wiring Diagram needed.
problem is probably some wire your disconnected, there should be a panel wiring diagram on the side panel where the sign, etc is. there are a number of things that will make it not start. everytime you mess with the wiring in the bus - except for headlight stuff, you should check to see if it will start. so you gotta remember what you do, and maybe write it down so you can re asemble the wiring as it was in the first place.
i havent done this, but one could bypass all that extra wiring, and just run a wire to the switch to the fuel soliniod. i have done that on excavators more than once, as the big ones occasionally get broken wires from all the vibration...
you can always start at the last thing you did, put those wires back in the correct order, and go from there.
also, if you disconnect some of the wires from things like the side door if you have one, one has to be grounded, and the other two have to be hooked together...
Jesus Christ... Conversion in progress.