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Author Topic:   OMC Ignition Switch
MarkoOR18 posted 02-09-2012 11:54 PM ET (US)   Profile for MarkoOR18   Send Email to MarkoOR18  
Hello. [The author begins by telling us he is] replacing a broken ignition switch for a 1985 Johnson 150-HP motor in the refit of my Outrage 18. Without looking at the boat--my first mistake--I ordered a Sierra five-pin replacement switch, #18-1801, which I though was correct. Upon removal of the old switch, I see there is no red plug, and the switch is wired directly, but there are six wires. Do I have a standard wiring harness? Or something different for there to be six wires?

Is there a way to wire the five-pin switch that will work?

I see Sierra also has a six-pin switch PN 18-1802, but due to cross-border mail order, I'd like to make the five-pin one work if possible. Thank you,
Mark

jimh posted 02-10-2012 08:29 AM ET (US)     Profile for jimh  Send Email to jimh     
An ignition switch for a c.1985 OMC engine should be in the pre-MWS wiring system era. I had a 1992 OMC engine, which was from the same pre-MWS era. Its ignition switch has terminals to connection of the various circuits using terminal posts to which one attaches the conductors terminated in solder lugs. You can see the arrangement of the six contacts in my article in the REFERNCE section

Ignition Switch Wiring
http://continuouswave.com/whaler/reference/ignitionSwitch.html

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