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To test the continutity of the glowplugs carefuly remove the conectors from the valve covers (DONT BREAK OFF CLIPS)They lossen up and get hot. Use A continutity tester on the two outside pins at each connector. I hope this helps.PS if you do break off clips replace the connector, Iv'e replaced two valve cover gaskets and two inside wiring harnesses ABOUT $120 when A $30 conector kit and 20 minutes would have kept them from burning up.
Mike: