The glow-plugs are in series. If one is bad, none will work. Had nothing to do with "heating up." The 1st plug is probably blown; thus none will work. If it's an original style plug - it's easier to just pull it out and look at it rather then try to test it. Those plugs have open coils so if one is bad, it is easy to see. Note those plugs run at about 1 volt each. So if you try to bench test one - and put 12 volts to it - it will just blow up in your face.
Bosch makes an upgraded 12 volt set of plugs that get hooked in parallel instead of series and work MUCH better then the OEM setup.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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