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Mercury Ignition Switch Question

Old 02-12-2012, 11:22 AM
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Default Mercury Ignition Switch Question

Guys

I would like to replace the old Mercury ignition switch on my boat.

It has 10 wires as follows:

2 Black Wires

2 Black with a Yellow trace

2 Red

2 Purple (pink?)

1 Yellow with a Black trace

1 Yellow with a Red trace.

My questions are can you use a 6 wire switch that I seem to see for sale all over place?

Does anyone have a color breakout for my switch?

Thanks!

Tommy D

Last edited by TommyD11730; 02-12-2012 at 12:35 PM. Reason: Edited post as apparently I can't count!
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Old 02-13-2012, 04:05 AM
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Just a bump with hopes someone can help me out.
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Old 02-13-2012, 05:52 AM
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The odds of finding this factory switch is pretty low. However there are alot of 6 wire, 3 position, with choke for sale on e-bay or the likes.

Reading on the net they suggest finding the "A" (Violet?) terminal. From there you work your way clockwise to M (black) then S (Yellow/Red) then C (Yellow/Black) then B (red) and finally to the 2nd M (Black/Yellow)

So I'm wondering. If my switch is currently wired as I described above can I use another Mercury switch (6 wire) if say a couple of wires are different color then mine?

Also, does anyone know if their is an industry standard for all these colors?

Thanks!
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Old 02-13-2012, 06:01 AM
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Have you googled Mercury wiring diagram? I see a bunch that come up but without knowing your year and model number I can't see if any are relevant. The other thing would be to purchase a factory service manual as it will contain these diagrams.
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Old 02-13-2012, 06:22 AM
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Originally Posted by SHAMROCK69 View Post
Have you googled Mercury wiring diagram? I see a bunch that come up but without knowing your year and model number I can't see if any are relevant. The other thing would be to purchase a factory service manual as it will contain these diagrams.
Can't say that I did the google thing. The boat is a 1988 Mako, and no doubt the harness and switch (1 piece) is OEM to the boat.

My Mercury 2004 Shop manual for the outboard currently outback (115 4-Stroke) did not have a wiring diagram for the ignition switch.

If you could locate a diagram for that switch that would be great! Heck if I just had a breakout of the colors I might be 1/2 way there. From some searching it does seem that Merc changed the color codes at one time though.

Thanks for the help!

Tommy D
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Old 02-13-2012, 06:37 AM
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So I did some searching around and found this:

So that means I would have....

It has 10 wires as follows:

2 Black Wires (Ground)

2 Black with a Yellow trace (Stop Circut)

2 Red (12V from Battery)

2 Purple (pink?) (Either Ign to 12V+ or Fuel Sender must confirm color)

1 Yellow with a Black trace (choke)

1 Yellow with a Red trace (Start switch to sol/ Neutral Start)


Right now the biggest question would be is that pink or purple. Not quite sure what "Ignition switch to 12V +" means, figured thats what the red lead was for.

Tommy D
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Old 02-13-2012, 12:48 PM
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ok, black wires are ground, black with yellow are the "kill" circuit (ie: when these wires are grounded, it grounds/kills the ignition circuit. one wire goes into the harness and back to the switchbox/engine and the other may come from say.... the emergency lanyard and that wire would end up grounded if the pull cord was... PULLED! , with the key in the "off position"/closed the black/yellow wires are connected (and therefore grounded) to the black wire (ground).With the key "on", the black and black yelloew circuit is interuppted or "open" and the engine is ready to crank and start. large red wire is 12 volts to the key switch (from the battery), purple wires are "switch'd 12 volts( hot only when the key switch is turn'd "on", yellow with red wire is cranking circuit (from/to starter solenoid and yellow black is "choke or Primer". You can get replacement Mercury switches in various sizes or lengths depending on what you have or what you want or you can get aftermarket also. again, styles and sizes vary BUT you need switch specificly for a later model outboard. don't confuse a stern drive switch for an outboard one. AND, there are no pink wires to the switch, pink would be for the sender on the fuel tank, The purple wires (not pink) are again "switch'd 12 volts, hot only with the key on.
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Old 04-21-2016, 01:31 PM
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Originally Posted by TommyD11730 View Post
So I did some searching around and found this:

So that means I would have....

It has 10 wires as follows:

2 Black Wires (Ground)

2 Black with a Yellow trace (Stop Circut)

2 Red (12V from Battery)

2 Purple (pink?) (Either Ign to 12V+ or Fuel Sender must confirm color)

1 Yellow with a Black trace (choke)

1 Yellow with a Red trace (Start switch to sol/ Neutral Start)


Right now the biggest question would be is that pink or purple. Not quite sure what "Ignition switch to 12V +" means, figured thats what the red lead was for.

Tommy D
Tommy, I am having this exact issue right now, working on replacing my ignition switch with the same wiring setup. Did you have any success? If so, could you point me in some direction? Thanks.
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Old 04-21-2016, 01:42 PM
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You sure you can't figure this out ? Name:  mp52000.jpg
Views: 14296
Size:  30.6 KB
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Old 02-22-2017, 06:26 AM
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Gonna bump this back to the top; calling mercury with my serial number, etc. has been fruitless.

I have a ignition with ten wires coming out the back as well; did you ever locate the right ignition?
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Old 02-22-2017, 11:07 AM
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Update: Mercury says this ignition was d/c in the 2009 timeframe, but they sold and used "a lot of them" until then. Part number is 88 107 A5. Its about $50. Ill update once it arrives and its installed.
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Old 05-24-2018, 03:25 AM
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Any update on this saga. I need to replace the ignition switch on my 2010 225 Optimax.
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