That is basically the ignition control module. Unfortunately, it is about like a light bulb blowing the filament. Just for any unknown reason, POOF! Out it goes from any one of the tiny circuitry items inside. As an old Dodge mechanic, I have no idea how many ignition modules I changed in them. Heck, I use to pull used ones at parts yards and kept a couple under the seat! Good luck......My '04 Yamaha T8 four stroke suddenly quit while trolling. The diagnosis was a bad CDI. Never even heard of it, but it's the brains of the motor, I guess. Almost never go bad, I'm told, but mine did. If your motor has one, that may be the problem.