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They will show REALLY LOW resistance with an Ohmmeter, if good. The trouble is, most common meters are not real good at reading low Ohms values accurately. I would think they would read less than a couple of Ohms, or perhaps even less than an Ohm. You could check the value of a new one, or known-good one, and compare that to the others. To check glow plugs, I use an Ammeter capable of reading 60 Amps. Connect the (+) side the ammeter to the (+) battery terminal, and, (after unhooking all the glow plugs from the wiring), momentarily touch the (-) lead from the test Ammeter to each glow plug one at a time, and note the Amp draw of each glow plug. DO NOT power up a glow plug for more than a second or two, as they may be damaged and break, causing engine damage, since you are feeding power direct, and the controller is not in the circuit to protect them. I don't know what the Amperage draw of your specific glow plugs should be. Typically, diesel glow plugs draw from 10 Amps to 30 amps each, depending on the specific application, and, for a specific application, the Amperage draw will be very close between all the cylinders. Since you are having trouble with one cylinder, you can compare the Ohms reading, or the Amperage draw of that glow plug to the others, and any substantial differance will indicate a bad glow plug.
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