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This test will determine what glow plugs are working. ( It will not determine a partially burnt plug ).

Disconnect the glow plug wires at the plugs .( You must unplug all of them for this test to work )

Connect a test light to the positive terminal of the battery. Touch the electrical connector at the end of the glow plug with the test light. If the light goes on the glow plug is working. Make sure you touch only the electrical connector on the plug. If you touch any other part (metal) of the plug the test light will light giving you a false reading.

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Q: Is there a test to see which glow plugs may not be working?
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