Wiring Help: Ignition / Kill Switch

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Makaw
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Wiring Help: Ignition / Kill Switch

Post by Makaw »

I have many skills, but electrical is most certainly not one of them. I’m having a bugger of a time getting the proper configuration on the addition of a kill switch for my old Starcraft. If someone would be so kind as to sketch me out the proper connection setup (electrical visuals are more helpful for me), I would be forever grateful.

If any other info would be helpful for a response, let me know. Here’s a bit of info that could be relevant. It’s a forward-steer boat with the original wiring harness, ignition switch and choke switch. The ignition is technically a push-to-choke, but it doesn’t seem to work (already tried). It’s had a separate choke switch since I was a kid. I’d like to keep it in the same configuration for now, just with the kill switch addition. I’ve already made various attempts to install and can’t seem to get it working correctly (I have to turn off the ignition AND pull the kill switch to shut off the engine).

Here is the diagram on the stock wiring setup. Thanks in advance.
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Last edited by Makaw on 05 Sep 2021, 22:00, edited 1 time in total.
Bloody-knuckled generalist. Current restomod: 14’ Starcraft Seafarer with '67 Johnson 20HP FD-21R

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DaleH
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Wiring Help: Ignition / Kill Switch

Post by DaleH »

OMC bridges the 2 M terminals, where black/yellow goes to raised M terminal and black/white to the other … but your wiring colors appear different.

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Makaw
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Wiring Help: Ignition / Kill Switch

Post by Makaw »

Unfortunately there is no color differentiation between the two black wires. Would it make a difference if they were switched from standard? I’m not presuming that it is wired correctly, especially since the kill switch issue was magneto related.
Bloody-knuckled generalist. Current restomod: 14’ Starcraft Seafarer with '67 Johnson 20HP FD-21R

MrGiggles
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Wiring Help: Ignition / Kill Switch

Post by MrGiggles »

Typically kill on OMCs is black/yellow, ignition is stopped when that wire is grounded.

I would get a volt meter and start seeing what each wire does, what you'll likely see is a switched +12v wire for gauges, a tach lead, a ground, the kill wire, and the choke wires. Sounds like your setup may already be somewhat home-brewed, looking at the factory diagrams may not be all that helpful.

From there it is just a matter of identifying the kill wire and putting it on the appropriate ignition switch terminal (grounded with the switch off).

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Pappy
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Wiring Help: Ignition / Kill Switch

Post by Pappy »

Yes.....it makes a huge difference.
There is up to 300vac on the black/yellow

MrGiggles
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Wiring Help: Ignition / Kill Switch

Post by MrGiggles »

Pappy wrote: 14 Sep 2021, 00:19 Yes.....it makes a huge difference.
There is up to 300vac on the black/yellow
That might tingle. :mrgreen:

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Makaw
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Wiring Help: Ignition / Kill Switch

Post by Makaw »

Many thanks to everyone for the input. It sounds like digging out the mulimeter and spending some time assessing the current setup is the best solution before trying to move forward.
Bloody-knuckled generalist. Current restomod: 14’ Starcraft Seafarer with '67 Johnson 20HP FD-21R