Start by disconnecting the foot control. That will tell you if that is the problem or not. Otherwise, it's probably the control head. I'm sure there is an SCR that controls motor operation and like any other solid state device, I could short once turned on keeping the motor running.
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
Bitter Gun Owner