Regarding "Thermostart" wiring!

[Arber]

Hey everyone my Ford tractor has a thermostart feature and I don't know where to wire it, wiring it directly to the ignition switch like on Massey Ferguson tractors wouldn't work since this particular ignition switch only has three modes OFF/ignition ON/Start, normally you'd want the switch to be a momentary or like I said on Massey tractors where it is spring loaded halfway. I'm not sure if Ford intended to use a stand alone momentary switch or? (If you do know of such thermostart switch please post the part number)
The ignition switch is original for this tractor!
Should I' replace the switch with one from a Massey Ferguson so that I can use the thermostart feature?
Thanks.

 

[TractorTech]

You have the original switch, C5NN11N572A r/b 82849165 which was 3 terminal for tractors without thermostart.

For thermostart, you need 4 terminal switch, E7NN11N501AC r/b 82849085 Switch Assy., Heater Starter, Diesel W/Cold Start.
Aftermarket $14 to 26. It will have OFF/Ignition ON/Start/Start + thermostart

Same key

 

[Arber]

You have the original switch, C5NN11N572A r/b 82849165 which was 3 terminal for tractors without thermostart.

For thermostart, you need 4 terminal switch, E7NN11N501AC r/b 82849085 Switch Assy., Heater Starter, Diesel W/Cold Start.
Aftermarket $14 to 26. It will have OFF/Ignition ON/Start/Start + thermostart

Same key

The part numbers you mentioned all refer to the same ignition switch where the only difference is the shape, my ignition switch looks exactly like the ones you mentioned with 5 terminals and only three positions. What I'm trying to say is there must be a pull type of switch like a choke. On the website It does mention the ignition switch has the thermostart option but you do need a four position switch for that not three! My guess would be Ford reused their old stock of ignition switches from their older gasoline models and they simply added a small momentary pull lever switch for the thermostar but I could be wrong.

Edit: You mentioned the "Off/Ignition ON/Start+Thermostart"
There lies the problem, thermostart needs to be ON for at least one minute before you start cranking!
Looks like I will be replacing the ignition with one from a Massey Ferguson 135, what an awful design choice by Ford .

 

[TractorTech]

Both switches use the spade key.
Pictures show the configuration of the diesel/thermostart switch. Position 5 is srart + thermostart
Here is the ooeration (Clockwise/Right):
1- Off: Key out position.
2- Accessories (Acc): Powers lights, radio, etc..
3- Ignition (Run): Powers the engine systems.
4- Pre-Heat (Thermostart): Hold here to heat glow plugs.
5- Start: Spring-loaded to this position (with Pre-Heat engaged) to crank engine; releases back to Run.