Have werry similar problem, motor diy driwing, not startin after that.
Problem was the (main) red wire which goes to the big fuse. The wire had werry bad connection to fuse and wire was just desintegrated from cable shoe on fuse to app 10cm !!
Wire must be shorten and replace with new one, after that works ok (knock, knock)
The problem starts because the connection bolt wasnt tighten enough or cable wasnt squesed in cable shoe. Anny hov, the wire resistance rise and wire owerheat and desintegrate....
Hope it helps