Thanks for getting back to me Nealh. Donne as suggested, almost impossible to get voltage readings through double insulated cables. Anyway, the hall sensor is working, led flashing as passage of each magnet, 12 magnets on the disc. Distance seemed OK, but I moved it closer at 1 mm. While the bike was inverted and slow moving of the cranks, I could feel and hear the motor coming on intermittently. I them checked all the connectors, unplugged and reconnected them. Switched everything on and still inverted ( no load), cranked the pedals again the motor did attempt to start but only a few times and intermittently. I then decided to remove the battery, controller and wiring off the frame and reconnect everything back so that I could easier wiggle the connectors to check for bad connections. Things improved, I could fairly consistently get the motor running, but not every time, and I suspect that if I put everything back into the frame, I would be back to square one. The controller seemed to be getting very warm and I wasn't even riding the bike, also the led display was all the time flashing on the"high" led. What do you think, perhaps the controller has had it. I checked all the cable for chaffing and they looked OK. The only place where I couldn't check thoroughly is where the cable passes into the rear wheel spindle and the hub. This could be a problem area I suppose. What are your thoughts. Could the overheating controller be a sign of it's demise, or a problem with the motor?