WCA
No power to either of the switch terminals with the ignition on?
I think the Haynes diagram may be wrong.
with power going directly to the motor on one side and an earth wire coming from the heater rheostat the motor is going to run as soon as the ignition is turned on ' if I disconnect the earth the motor stops.
if I disconnect the power the motor stops.
I have temporally put a on/off switch on the power lead
until I can figure it out