Rambo Cruiser

[Jewellbaby]

Hi, I acquired a rambo cruiser my brother built with the bigger battery pack. I rode it a good 25+miles and it worked fine, except tires flattening every 3days. So I changed out tires and tunes @home. They're great but the power assist won't kick on and truckrun screen flashes off after first pedal gear 1/power 1. It took a few months to earn money for new tires, so the bike did sit on patio for a few months where sprinkler possibly could have gotten something wet...

Would anyone suggest the motor is dead, or maybe a sensor replacement? The battery shoes life disconnected from bike bracket. I've watched various videos but cannot seem to find a wire connector bad, except for sensor by back tire kinda had a kink in it.

Any ideas is appreciated!