not working

My yose power kit came with a front headlight that don't work? It did work then stopped. I could not find out why but had problems with the controller setup, so I factory reset it which seemed to fix the light, however, it's not working again. I've tested and no power to the pins in connector...

Okay so... was riding home from uni when all of a sudden the bike felt very heavy, straight away I could tell the motor wasn't running. So I pulled the throttle assuming perhaps it was the PA (Had problems in the past with the magnet disk) and it was working but was feeling very jittery and...