Magneto helm Starter Switch wiring

[fleetwin]

crosbyman wrote:

all you need to do  to kill the engine is to join both points via a normally open switch.

 

the kill button (N/O) is or can be mounted on the engine  and  a pair  of M wires sent to  the 2  M posts on the key.   when OFF the key shorts the 2  BLACK  M wires  and kills the engine.

 

True, but I’m thinking he does not have the original stop button on the engine anymore, so it is more of a question just where on the engine the two stop wires (that lead up to the M terminals on the key switch) should be connected…  The darn vacuum cut out circuit confuses this issue.  True there are two leads hanging off the engine, but they don’t look stock, so no guarantee they are connected properly…  I will have to find one of Frank’s wiring diagrams, I was careful to save them when he nicely posted them for us

[outbdnut2]

This wiring diagram should be the same as your motor.  Click on it or print it to make it big enough to see:

Dave

 

[crosbyman]

lots of them on …

EVINRUDE JOHNSON Outboard Wiring Diagrams — MASTERTECH MARINE —

 

and  downloading the  Red /white  bible helps all these oldies

https://watercraftmanuals.com/outboard/johnson/manuals/johnson-302231.htm

 

the blue circle does not help much lately….

Joining AOMCI has priviledges 🙂

[Chris Koure]

Thanks so much for that.

That’s exactly what I’m going to do.

The only variation in my setup will be using the “Red Plug” from slightly newer OMC outboards. I will however be upgrading the carburetor to one from an earlier 1957/58 35 HP with the electric choke, (I couldn’t resist). Because the Magneto key switch (in the off position) connects the “M” lines I’m putting an E-stop in the lower cowling also using the same “M” lines. I greatly appreciate your assistance in reviewing my plan.

Chris

[Chris Koure]

For all that helped me thank you very much. I’m attaching pics to show I’m almost done. I’ve used the “big red plug” setup from the 70’s – 80’s. (Including current wiring set up.) Note: my pic file size is too large for all so I’ll add in the next post.

[Chris Koure]

Second pic.

[fleetwin]

OK, this wiring diagram is more representative of what you have.  Your engine does not have those micro switches on the horizontal throttle gear.  Yours has the cut out/ground switch on top of the block on the right side.

So, the two M wires from your key switch get connected to the engine as shown in this diagram:

One is connected to one set of points (there should be a black wire coming down from the mag plate that has a “knife connector”.  The other “M” terminal lead is connected to the vacuum switch threaded post.

It is super important to remember that these two “M” terminals/leads on your key switch are not to be used for ground leads for any other accessories.  If you inadvertently use one of these leads as a ground lead, you will quickly melt one or both of the coils.

By the way, your wiring job looks well thought out and very neat, nice work!

[Phil Budne]

I looked up Seadog 420351-1, and found it for sale for magneto engines BUT it also says the ignition terminal gets 12V when on (for accessories), but not when cranking.

If you have a meter or a test light you can check the connection between the battery and ignition terminals.  If they’re connected in any switch position do not connect the ignition terminal to your magneto!

I’d look for a version of the switch with two M (magneto) terminals, that are connected together in the off position, and never to anything else!

 

http://www.omc-boats.org
http://www.aerocraft-boats.org

[crosbyman]

see diag.   however you do it   the end result  to kill the ignition is to establish  continuity between the 2 points .

Joining AOMCI has priviledges 🙂

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