I am in the process of tracking down an intermittent loss of thumb throttle control on a friend's 902 system E-bike. The problem is probably in the wiring harness, which I will look for when I get access to the bike. Currently I suspect a ground wire fault.
But I would like to know exactly what are the connections inside the throttle itself?
I have measured DC resistances between combinations of the red, white and black(ground) wires from the throttle, but moving the throttle lever doesn't seem to change any of these resistances. So I am at a loss in knowing exactly how the throttle works.
How can I check the proper operation of a thumb throttle by itself (not connected into a system.)
Roy
