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Author Topic:   Ignition Wiring
dhamor posted 12-02-2006 12:28 PM ET (US)   Profile for dhamor   Send Email to dhamor  
My friend Charles removed the ignition switch and all wiring at the helm to refinish the woodwork.
Looks beautiful except - now it won't start.
Charles said he made a wiring diagram and put it back together the exact same way. I have my doubts, I found two loose connections, never a good sign.
The ignition switch has five wires and six terminals.
Here's what I found.

Wires (I traced them out):

Red - from Battery (+)
Black - engine Ground (-)
Purple - Choke
Yellow/red stripe - to starter solenoid
Black/yellow stripe - to ignition coil.

Ignition switch (the way he re wired it):
M - Black/yellow - Ignition Coil
B - Red - Bat(+)
M - Black (-)
I - open terminal - no wire
S - Yellow/red - Starter Sol
C - Purple Choke

What are the M terminals for ?
What should be on the I terminal ?


alfa posted 12-02-2006 01:01 PM ET (US)     Profile for alfa  Send Email to alfa     
Don't know what is your motor.
But in reference section, there is valuable information.
Have a look
jimh posted 12-02-2006 04:21 PM ET (US)     Profile for jimh  Send Email to jimh     
See the article on this topic in the REFERENCE section:

Ignition Switch Wiring
by James W. Hebert

dhamor posted 12-02-2006 09:56 PM ET (US)     Profile for dhamor  Send Email to dhamor     
Alfa, jimh,

Thanks for the quick reply.
I reviewed both links, Charles engine is a 35 HP Evnirude, 1985. The cable from the engine the helm is a 5 wire.
When I removed the switch - nothing was attached to the (I)terminal.
Is there supposed to be a jumper between the (I) and the (M1)term ?


Chuck Tribolet posted 12-02-2006 10:37 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Does it turn over, but not start, or not turn over at all?

And I suspect Purple should go to I, not Choke. Purple is
usually a wire that's hot when the ignition is on.


jimh posted 12-03-2006 04:31 AM ET (US)     Profile for jimh  Send Email to jimh     
It is impossible to tell how your boat is wired. The diagram shows a typical OMC installation. The color of a wire's insulation does not always reflect its use. Some installers may use whatever wire they have on hand, and not follow the color code guidelines presented in the REFERENCE article.

A motor has to be supplied with +12-volts on its ignition lead. This is normally a VIOLET conductor and is attached to the A (or I) terminal of the ignition switch. If this wire were omitted a motor would not start, even if it was cranking.

dhamor posted 12-03-2006 07:36 AM ET (US)     Profile for dhamor  Send Email to dhamor     
Dera Chuck, jimh,

The engine does not turn over, but it did when Charles bought her. Charles removed wiring from the helm and did some re-wiring, the running lights, helm light didn't work when he bought it. So he removed some wiring and ran a seperate cable from the battery to feed the lights.
The purple wire goes to the choke, it's the only function that works. Push the key in and the choke closes. The choke itself has a purple wire attached to it.
There is a black wire with a yellow stripe that goes to the ignition module, I suspect that it needs 12V when the key is in the ON position.


jimh posted 12-03-2006 01:48 PM ET (US)     Profile for jimh  Send Email to jimh     
The engine cranking circuit is about as simple as electricity gets: a battery, a switch, and a solenoid coil. You hook the battery to the switch, and when you turn the key the switch supplies voltage to the solenoid.

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