Test sequence

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Pull glow plug connector off glow plug.

Fig 1: Voltage Test Lamp Wire Connected To B+ Using Adapter Clips

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Connect diode test lamp wire using auxiliary clips from auxiliary cable set to battery positive (+).
Place diode test lamp probe on each glow plug one after the other.

Diode lights up: glow plug OK.

Diode does not light up: replace glow plug.

Remove and install glow plugs with Hinged socket 3220.

Tightening torque: 15 Nm.