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Can you help - scooter serial no 935112943?

I have replaced correct batteries in a Booster electric vehicle serial no 935112943. All electrics work fine but there is no power to the motor and I don't know where to start to find the problem.
There is no response from the control lever on the handle bar.
Nick Sweet, March 2013
link Click here to see other fixes for Boost Mobility Booster.