Well, as was said above the relay could have gone bad. It may be clicking but no current is going to the plugs. That will be easily diagnosed with the test light at the glow plugs when you turn the key. If thats good than go down the line disconnecting the bus bar and checking the resistance of each plug. Obviously if there is no continuity its bad, and if one is shorted the resistance will be super high. I cant remember what is normal, but lets say it was arounnd 200 for a normal plug. The bad one was up around 700 or something like that. The difference in the reading is very obvious.
Jaon
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