Usually glow plugs are only tested by putting a test light to the terminals. The clamp will go on the positive battery post and the pointy end of the light will go on the terminal for each glow plug. However, this test is pretty hit-or-miss and the proper way is to check the resistance.
My friend and I were bitten by the resistance check though about a month ago. All glow plugs tested good on a cold engine. Once current was supplied to the glow plugs though, some would go open (no continuity through them and hence no heat) and he would have a hard start and rough running once it started.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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