Seems there are two types of start/glow switches. Those that have separate glow and crank and those that have combined glow and crank in the start position. I don't know of any that crank in the glow position.
if you could get a wiring diagram it would be easier to rewire it then try and get the old wiring to work.
this old girl would be fairly basic electrically.
Old beek. That to me would be simple just to wire sorta in my head. I personally would want my glow plugs on momentarily before I cranked on it. So I would keep the glow plug circuit completely isolated from all else even if it’s on the same physical switch. Even if the glow plugs are energized while cranking the starter would rob the voltage and they would not help anything. And by the way all the new equipment I have dealt with lately have glow plugs on before start, on a timer. Then when the timer times out the light goes out and you know to crank. Sir I hope I gave you an idea and best of luck. Mike Hudson
even if the starter draws the voltage down to half you would still get half of the glow plug output
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