Emergency kill circuit ?

[spareparts]

try cranking the engine with that wire connected, but with the engine harness disconnected. Start out by running the engine like you had it with the black yellow wire disconnected, then after its warmed up and will start easy, hook the wire back up, disconnect the main wiring harness on the engine. Go to the starter solenoid, jump from the big red(battery cable) to the yellow red(it may take a jumper wire) and see if the engine will run, that will tell you if its the engine side, or the boat side. If it runs with that black yellow wire hooked up, but with the harness disconnected, the engine is OK. While its running, turn the ignition key to the run position, with the kill switch in the run position. Hook the harness back up, if the engine shuts down, there's something in the boat side that causing the trouble. Several things to check on the boat side if its the problem, make sure you have the wires on the key switch correct terminals, make sure you have an outboard key switch and not an I/O switch. Make sure your kill switch is for an outboard, if it has 4 terminals, make sure you have it hooked up to the no terminals