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Just a follow up... It is now fixed. I replaced the ignition switch (66101-55200) and the glow plug light comes on and it started immediately in 25 °F (after about 8 seconds of glow plugs). Thanks for all the help.

I also checked AC Red/White (2) to 30 Red (4) and that only has continuity in start position. (And it should have continuity in the warm position.)

Ok, testing resistance off of (1) Black/Red and (4) Red, with key held in warm position. Saw no continuity (in any key position). So it looks like the switch is the problem.

Where is the 19 Terminal? That diagram seems to show two AC terminals? Is it labeled wrong?

Sorry for late reply... just double checked there is zero voltage at the glow plugs with the ignition key held in the warm position. And the tractor is extremely hard to start in cold weather and starts fine in warm weather. Runs great once started, so everything points towards the glow plugs...

The glow indicator is the second light on the dashboard.

My glow plugs are not working. When I turn the ignition key to the glow plug position - the light on the dash does not light up. I don't hear any click of a relay, so I think it is the relay. But I can't find the relay after buying a new one (16415-65600). Can someone explain where the glow...