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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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