It would be interesting to find the results from the following: Put Safety switch to ON. Put Start switch in the ON position. Try to start coach from the front key. If it starts, go back to the Start switch in the rear and turn it to OFF and see if the coach continues to run.
Let us know the results. Here is my hypothesis. If the coach does start that way and doesn't stop when the rear Start switch is returned to OFF, the key ignition is not sending voltage to the rear to energize the starter circuit. If the coach starts from the front but dies as soon as the rear Starter switch is turned to OFF even though the key is still on, the fuel solenoid is not being energized by the key ignition in front.
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