Just for clarification the only wiring between the power master system and the IGN Switch itself is in feeding the RLYS fuse from the IGN switch.
Hot in RUN only wire out of the IGN switch is ORANGE.
The power master is cycled via the pressure switch and the relay and can only work with the IGN switch in RUN,
Power to run the motor is fed by the relay HD contact and is via the 30A fuse for the power brake and is fed by a fusible link with no connection to the IGN switch.