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Author Topic:   Ignition switch wiring for 1999 Johnson 40 hp
JL8Jeff posted 03-13-2006 10:21 PM ET (US)   Profile for JL8Jeff   Send Email to JL8Jeff  
[Please see link at bottom of discussion for accurate information on ignition switch wiring--jimh]

I'm converting my controls from a side mount(mounted on the side of the center console and gets in the way) to a top mount OMC control for my 1999 Johnson 40 VRO motor. Going off the side mount control ignition switch wiring, this is how I have the top mount ignition switch wiring hooked up:

Switch Wire
Terminal Harness
S Yellow with red stripe(goes to neutral safety) [PROBABLY WRONG! More likely the SOLENOID or starter motor relay--jimh.]
A Purple(accesories)
C Purple with white stripe(goes to choke)
M Black with white stripe(ground for magneto)
M Black with yellow stripe(ground for magneto)
2 Red with purple stripe(12V power for switch)

Do these connections look right? I pretty much followed the wiring on the old controller to the old switch since it's still hooked up. This is a 6 wire harness. The power trim is another harness and the System Check alarm is a different harness as well.

bsmotril posted 03-14-2006 11:28 AM ET (US)     Profile for bsmotril  Send Email to bsmotril     
I copied this out of a thread some months back on this same topic. I am no tthe author, but I have used this info myself and it worked for me:
Black: Ground throughout.
Purple: Instrument lights throughout.

Trim-tilt switch:
Red w/ white supplies power.
Green w/ white: Up or down (don't see which right off)
Blue w/ white: Up or down

Trim guage:
White w/ tan: signal
Black: Ground
Purple: Instrument lights.

Alarm beeper ("horn"):
Tan w/blue: Signal
Purple: Instrument Lights.
It's unclear what the return path is.

Conventional Tach:
Grey: tach signal.
Black: Ground
Purple: Instrument lights.

Ignition switch: 7 pin connector.
No details in the manual.

SystemCheck TachL 8 pin connector.
No details in the manual.

Looking at a manual I have for the 55 hp motor with electric start:
Yellow Red - Neutral Switch
Purple White-Choke
Purple - Goes to one side of temp warning horn. Also powers instrument lights on my boat.(accessories, switched to Red Purple with the key in run position)
Black Yellow - magneto grnd
Purple-Red - Input of Fused Power right from battery switched to Purple wire with key in run position
Black White I show as alternator output going to the ignition module
I also show a Black Grnd to the switch which is switched to the Black Yellow grounding the magnetos with the key in the off position

jimh posted 03-14-2006 06:10 PM ET (US)     Profile for jimh  Send Email to jimh     
Here is a link to accurate information about wiring color codes used by OMC:

JL8Jeff posted 03-15-2006 11:37 PM ET (US)     Profile for JL8Jeff  Send Email to JL8Jeff     
I looked at that link and the colors don't quite correspond to the newer ignition switch. They're close, but not quite the same. My new OMC binnacle control is a Bombardier control so maybe they changed things around slightly or they're using a new supplier for the ignition switch and wire harness. I've got everything bolted in so I can test it pretty soon.
jimh posted 03-16-2006 12:37 AM ET (US)     Profile for jimh  Send Email to jimh     
Please let me know what information is at variance with your engine harness.
jimh posted 12-31-2006 04:46 PM ET (US)     Profile for jimh  Send Email to jimh     
Here is a diagram of the ignition switch wiring:

seahorse posted 12-31-2006 04:59 PM ET (US)     Profile for seahorse  Send Email to seahorse     

You might want to add some info to the following wire codes on your page.


YELLOW with RED stripe = START (to starter motor relay)

should say that it goes to one of the yellow or yellow banded wires on the control mounted neutral safety switch and then the other switch wire goes to the starter solenoid small terminal.


WHITE with TAN = Trim SENDER isolated fused battery positive

That wire is the sender wire going to the S terminal on the trim gauge. The violet wire is the switched B+ from the ignition switch that goes to the I terminal to power the gauge.

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