I have an aftermarket emergency cutoff switch to install. I've attached a copy of the electrical diagram. I'd like to know, do I want my switch to complete the circuit for run? Or do I want it to break the connection to run?
That depends on whether you have a battery ignition or a magneto ignition. I/O's are battery ignition (require a battery in order to run). Therefore a kill switch much OPEN the circuit to kill the engine. Outboards are typically magneto engines and do no require a battery to run. These engines require that the kill switch CLOSE the circuit to kill the engine.