Correct wiring ignition switch for Standard 23 C

FxFerry

Member
I had to replace the ignition switch on 1958 Ferguson TO 35 with the Standard 23 C diesel.

The old switch was wired so that the resistor and glow plugs were NOT hooked up. Don't know why, I checked everything over on them and cleaned all contact points of wiring nothing seemed amiss.

Old ignition switch would engage starter if you turned it to right or left. I don't think this is correct.

Installed new switch which is sourced from here and is indicated the one with "heat" position for a 23 C.

I have again cold start with turn to right, and resistor/glow plug if I turn to left, but this also immediately engages the starter.

I thought the heat position was just that and you held it for 30 seconds, then turned key to start.

Have I connected the wiring wrong?

New ignition switch looks like the old one with 3 larger prongs on back, (marked 1, 2 3,) one of which has a smaller prong attached pointing toward the center of switch making a total of 4 connection points.

Any thoughts or pix of what the correct path is.

Fx
 
1/ Power feed in
2/ Cold start heater
3/To starting motor.
The smaller terminal should be with terminal 1 and was used for the feed for lights.
 
I found a diagram, tried to send the link but it doesn't work...

It showed 4 terminals on the switch.

1 and 2 (tied together in the switch) = start
3 = from the ampmeter
4 = preheat

If your switch is different, use an ohm meter and determine which terminal is the common. The terminal that is connected to nothing when in center, start when turned right, heat when turned left. That terminal will be the battery (from ampmeter) terminal. The other two will be start and heat.

If it still wants to crank in the heat position, look over the wiring, someone may have jumpered the heat circuit to the starter circuit elsewhere.
 
The switch arrangement on the UK version and I think that Detroit used the switches from UK in the Engine kit. was just turn to clockwise to start Engine normally without heaters BUT turn counter clock to Heat and then Heat and Start..John(UK)
 

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