The procedures For trouble-shooting

1. Breakage
Before replace it, check it to see if the glow plug has been wired properly. Check with a tester also to see if any more than the rated voltage is being applied to it.
 
2. Short-circuits or Resultant breakage
Repair any shorted parts of the wiring before replacement.
 
3. Faulty starting
Remove glow plugs and apply a rated voltage to check for heating (In most cases, bad starting may be due to other causes.)
 
4. Bent glow elements or brokage
In replace of a new plug. also checking engine for timing or excess of fuel injection etc. 5.Bulging glow tubes (Sheathed types) Replace with a new glow plug.

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