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I don't know of a "Glow Plug Switch" listed in the manual. Can you reference which TM and page?
In any event I do not believe it is the same as the glow plug temperature sensor. The temperature sensor is mounted on the top rear left side of the head, and has 2-wires running to it. Remove the...
A couple of things I would try would be to replace the glow plug temperature sensor, and the glow plugs if they are old as you describe even if testing OK. Those are 2 easy things. Both can be purchased from CUCV electric.
I am fairly certain the glow plugs should cycle on for a brief second...