turn the speed up some, unplug Charger, put brake lever in drive mode - hard to push, restart with the key. make sure no damage has happened to the wiring harness that connects to the back. Circuit break may need to be pushed in. this is a start. Next thing would be the Throttle and speed pot.
I’m happy to assist further over the phone at
https://www.6ya.com/expert/bill_bcbb89783b08c489
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