Mobility Scooters

This may soundc crazy but try waving a magnet in front of the joy stick. It has been known to work.

I would get the batteries checked for power. Just because your charger shows fully charged quite often the batteries are low but enough power for lights or horn which does not take much power. i suspect bad batteries.

If the scooter functions OK backwards & forwards and drives the distance you require, then i would hazard a guess at the PCB in the tiller head, paired with BDI (Battery Display Indicator).
Batteries on the Breeze are most likely 70-100ah, and ideally must be kept charged, either after use or at least once per week if you are not using it. Failing to do so will end up costing a lot of money :-)

Your break release shifter is in the push the scooter mode. Put it back in gear and the horn doesn' beep and it should run..
The horn beeping is the alarm to tell you the break release is on.

It is usually located under the seat on the body of the top of the battery housing. Looks like a stick with a ball on it.

go to electricscooterparts.com get a rear wheel clutch assemly fixed ours!!