HI again Random
Sorry for the very quick, off the cuff, response earlier. I only had a chance for a very quick look at the diagrams etc. before I set off travelling. From that it looked like the connection you were discussing might involve inhibition of starting if the rotor brake is applied or clutch is engaged rather than any kind of power supply. I'm afraid I still haven't had time for any kind of deeper look and it is nearly thirty years since I last flew a Robinson. Generally these diagrams are rather simplified for us simple pilots :-)
Cheers
TeeS