Which connector on this key switch is which?

[woodman-46]

Hello,
I am replacing the key switch ( photo attached) on a ride on mower. I have bought this one which seems good quality but instead of letters by the connectors on the back which I was expecting there are numbers.
It is a three position switch OFF, ON and full turn to the right which springs back to second (ON) position that would activate the starter motor/solenoid I guess.
From looking at this photo can someone tell me which connector is which and which number might correspond to which letter? I have marked on photo what numbers they are.
Thanks in advance

 

[conny]

A photo of the old switch contacts would help.

 

[woodman-46]

Thanks, I don't have it it was not on mower when bought.

 

[crystal ball]

mower key switch wiring

Might be here

 

[Tigercubrider]

What mower is it? Model?

 

[woodman-46]

The new ignition is not made for the mower it is a universal one. Normally they have letters, this one does not. Thanks

 

[oldbutnotdead]

You got a multimeter? Meter through all possible combinations with the key in each position (don't neglect OFF, if its magneto ignition then switching off may be making a circuit not breaking one).Draw up a table, enter the results, you'll soon work it out (or post it here)

 

[AndyPRK]

Reminds me if a tractor one which had glowplug position

 

[Ian2008]

That is a generic switch for a diesel engine.
NO 1 + feed in
NO 2 Ignition Connection
NO 3 Heater plug connection
NO 4 Starter connection