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Proud to be Deplorable
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29,904 Posts
Looks like the pin out is right with the M on there, but you want to double check before installation. Mainly, no power to the M pin and it shorts to ground when off.

Edit: I did a little parts looking and Sears calls for a 3492r or 583732501 for the ST16.
 

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Elf guardian
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7,712 Posts
Discussion Starter · #3 ·
I have the original 4 pin switch that is labelled as in the wiring diagram.

The kill wire comes from the "D" pin, and the body of the switch is grounded.

The other pins are "B" battery

"S" solenoid

"C" charge circuit

correct?

What does "D" stand for?

Schematic Font Parallel Engineering Pattern
 

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Red Tractor Nut & Diesel Addict
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32,409 Posts
Never noticed a switch with a "D" pole! A switch with an "M" is correct though, as it stands for magneto & is a grounding circuit.
 

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Registered
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3,832 Posts
Which one is the correct one?

Is it this one from Stens?

attachicon.gif
switch.JPG
Will my 1968 MF12 has the same switch your showing from Stens obviously not original as the manual shows the same 4 pin switch your showing. Mine never did charge so maybe this had something to do with it. I too don't know what the D pole is for.
 
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Elf guardian
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7,712 Posts
Discussion Starter · #7 ·
I had 2 of them with the "D" pin. They wouldn't hold the key when in the off position, so

I changed them out with new ones that I bought from MF dealer. I don't have those ones

handy at the moment, but will look at them soon.

They check out to work in the circuit here.

If using this switch, there is no pin for the DC wire from the regulator. I suppose it could go to

the "L" pin, and work properly. Am I right here?

Jim, how was your DC wire dealt with? Your reg could have been the problem too.
 

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Getting Out!
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8,205 Posts
D is for DONE! Stops tractor when done using. :smilewink: L on most switches if for Load or Lights and runs those items when key is on. M poles are needed for Magneto equipped tractors and NOT battery ignition. It is a ground. These are little odder marked switches, not familiar with those, but would bet same as some others, just odd labels we don't usually see.
 

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Elf guardian
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7,712 Posts
Discussion Starter · #9 ·
D is for DONE! Stops tractor when done using. :smilewink: L on most switches if for Load or Lights and runs those items when key is on. M poles are needed for Magneto equipped tractors and NOT battery ignition. It is a ground. These are little odder marked switches, not familiar with those, but would bet same as some others, just odd labels we don't usually see.
Metric maybe Eh? :smilewink:
 
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