How do I test a glow plug?

Method 1 Testing Glow Plugs in the Engine
  1. Grab a multimeter.
  2. Set your multimeter to ohms.
  3. Find resistance value of your multimeter.
  4. Test the voltage of the battery.
  5. Locate the glow plugs.
  6. Remove the caps or connectors to the glow plugs.
  7. Clip the multimeter's negative lead to a ground point in the engine.
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