Thanks for that Mark, sounds like an excellent lead and promising. Trouble is I can't locate the switch that you mention and it's difficult to trace back from the controller through the harness. I've even checked PP and others for the switch you mention or P/N to guide me in what I'm looking for, so,
I've just whipped out the motor to see exactly what's in back 
! Could you discribe/mark the location for me please.
By the way, the 'appropriate pin' on the relay/controller is pin 10 and when connected is inaccessible.