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I have found that the best way to check the glow plugs is this: Take a jumper wire and connect one end to +12v. Remove the glow plug wire harness from the relay, and touch the other end of the jumper wire to each of the glow plug terminals in the plug. If it makes a little spark, the plug is good. No spark, the plug is bad. It is just that simple. I have found using a meter to be very unreliable. Even some plugs that check good with a meter, are bad with this test. Of course the best way to check is to remove them and apply 12v directly, and I do that anyway after replacing the bad plugs just to be sure....Rich
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