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88 Merc Outboard Won't Shut Off

I have an 88 Merc 45 hp that won't shut off when the ignition is switched off. I replaced the switch and that didn't fix it. Am thinking that there's a wire or something loose in the engine - maybe the magneto needs to be grounded and that's not happening. Anyone have any advice? Thanks!
Daniel19
Apr 18
2006
You are on the right track. The default condition of most outboards (before computers) is "run". You short out the ignition to stop them. gfretwell
Apr 18
I'll kep plugging then. I think I need to look for a black wire with a yellow stripe, someone told me. Thanks for your post Daniel19
Apr 19
You are on the right track. The yellow black wire is the kill circuit. Have you tried activating the Kill switch if so equipped. The ign. swithch and kill switch are on the same wire.(BL/Y) walleye481
Apr 19
The bl/y wire is attached to the switch box. You can remove this wire and test it with an ohm meter or continuity tester. One lead to the wire the other lead to ground. When key is turned off should show continuity. The other possibility is a bad kill circuit in the switch box. To test the kill circuit you will need a DVA meter. Usually only repair facities have this meter. Hope this helps. walleye481
Apr 19
   

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