Hi Roy,
1. It doesn't contain a switch that applies full throttle to the motor system as the GM Pedelec sensor uses a series of magnets to produce a pulsed output.
The frequency of the pulses varies according to the pedal rpm
(cadence) and the controller provides variable power to the motor based upon the actual pedal rpm:
![](https://i.imgur.com/1R2HtWr.png)
If you slip the chain off the chainwheel
(or ride in a very low gear) you can actually control the speed of the motor just by varying your cadence.
2. Although it uses a Hall sensor, the pulsed output means that it cannot be directly used to control the operation of the thumb/twist throttles.
However, it should be possible to use the output from the sensor
(in conjunction with a 555 timer chip and a few other electrical components) to activate a 5V relay that would only connect the throttle signal to the controller only when the pedals were being turned:
![](https://i.imgur.com/YKANESm.png)
I don't know if the above circuit will actually work, or whether it might need a diode on the Hall sensor output that would only allow the high voltage pulses to reach the 555 timer chip.
![Undecided :-\](https://goldenmotor.com/SMF/Smileys/default/undecided.gif)
Unfortunately, it is not quite as simple as you had originally envisaged.
Alan