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If it is not the switch and from what you said, I could go from the switch terminal that shows 12 v when turned CCW to a new push button, no latching, on the control panel and from that switch to the gloow plugs all using 10 or 12gauge wire, When I turn the switch CCW and push the button for 3=5...

Thanks for the above procedure. The bulb is good. Yes , key goes CCW forglow plug and indicator light than when all working correctly, goes out after 3-4 seconds. Switch was replaced 2-3 years ago so relatively new compared to the machine. From what you describe I could run a new 12 or 10 gauge...

The KH41 has a timer relay that the light comes on when keyturmed to glow plug position andwhenthe light times out you go to crank and away she goes. Would a 15amp rated switch now work without a relay??

I don't think it is the timer /relay. suspect wiring between the control panel and the engine compartment - wiring looks sketchy/suspect. My old KH41 pretty sloppy as well but big $'s to restore so will keep it going as long as I can get some work out of it.

A new timer relay for the glow plug light and glow plugs did not fix the problem. Now considering a starter typ 15a rated button to provide 12v directly to the glow plugs. Glow plugs energized by the non latching push button - plan is to hold it on forthe 3-4 seconds before release and then...

Thanks for the reference. I had found that diagram somewhere else but it was unreadable when trying to trace the wiring but the reference you provided is much cleaner and easy to follow.

I'm very sure my JD 3020 Yanmar engine has an air heater start assist and has never let me down in 14 years of Canadian winters. The old Kubota KH 41 with +4600 hours wasn't as happy starting on the hair dryer as glow plugs but hair dryer dot the job done. When I was looking for info re glow...

Thanks for all the input. Glow plugs are ok as is the wiring to them. I was able to confirm that the lamp timer is also a relay for the glow plugs and is wired in series with the glow plugs so if the lamp does not come on the plugs don't get power. A new timer relay is on it's way. In the...

Looking for readable wiring diagram for KH 41 glow plugs. My old KH 41 has a timed green light when key is turned for the glow plugs. Green light stopped working as did the glow plugs (no starting without GP's). There is a timer for the green light so wondering if the timer is defective does it...