Poncho,
If the PTO dash light stays on, the switch is OK. If the switch were bad, it would also release the fuel solenoid and kill the engine. Both are fed off the same switch contact.
If the seat switch was bad, it would also release the fuel solenoid and kill the engine.
What is the serial number of the 455? There are two schematics depending on the serial number.
GotDeeres
If the PTO dash light stays on, the switch is OK. If the switch were bad, it would also release the fuel solenoid and kill the engine. Both are fed off the same switch contact.
If the seat switch was bad, it would also release the fuel solenoid and kill the engine.
What is the serial number of the 455? There are two schematics depending on the serial number.
GotDeeres