Northern Lights — Glow Plug Testing

Testing & diagnosis · Glow plugs

From a Northern Lights owner's manual covering: M20C, M844, M844L, OM844K2, SP5, SP6. Check it applies to your exact model before use.

Applies to: Northern Lights M20C, Northern Lights M844, Northern Lights M844L

Procedure

1. Loosen the current carrying flat wire between the plus-poles of the glow plugs.
2. Connect a D.C. test bulb between the plus-pole of the battery and the plus-pole of the glow plug.
3. If the bulb lights up, the glow plug is functioning properly.
4. Check all glow plugs and replace any faulty ones.

Full service-parts list: Northern Lights M20C →, Northern Lights M844 →, Northern Lights M844L →

Source: Northern Lights owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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