Re the current glow plugs: You are correct the indicator on the dash is a resistor and gets hot and glows in the dark, Don't hold the switch on to long or you will burn out the indicator. The 6V you measured at the first glow plug is about normal. If the reading is 12V then one or more glow plugs are burned out. The glow plugs are wired in series. Take note of how the copper wires goes between each glow plug, the outer and inner pattern. The last glow plug is grounded to the engine block by the water pump. I would clean the contacts on the copper wires and the bolt on the engine block. DO NOT put 12V directly on a glow plug or it will burn out.
Re using the glow plugs, a lot depends on the condition of the engine compression and the temperature of the engine block. I live in Canada about 150 miles north of Watertown NY and in summer when temperatures in the morning where in the 60 to 70F, holding the glow plug switch for about 30 seconds or when the dust just started to burn off the dash indicator was enough to start the tractor and once tractor was warmed up it could be shut off and glow plugs were not required again for a start.
In winter it was a different story, had to hold glow plug switch until dash indicator glowed red and sometimes if tractor was shut off for an hour or more and engine cooled off, the glow plugs were required for a start.
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