Quizzes & Puzzles21 mins ago
cars
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For more on marking an answer as the "Best Answer", please visit our FAQ.another way is to remove the wiring going to the glow plugs and then connect an ammeter between the main lead and one glow-plug at a time ar eading of 11-20 amps will indicatethat the plug is working.
If you havent got an ammeter or cant take the glow-plugs out do it this way: take all the cables off the glow plugs then connect a wire to the positive + of the battery, then in turn just touch the threaded end of the glow plug quickly and if you get a spark it indicates the plug is working. no spark means a dead glow plug (or poor connection at battery) if you get a noisy "crackin" spark it means the plug is short circuiting.
at the end of the day you could take them out to test as paul above mentioned.