Northern Lights — Checking glow plugs
Testing & diagnosis
From a Northern Lights operator's manual covering: M16, M20, M20C, M844, M844L, ML844, ML844L, NL844. Check it applies to your exact model before use.
Applies to: Northern Lights M20C, Northern Lights M844, Northern Lights M844L, Northern Lights ML844, Northern Lights ML844L, Northern Lights NL844, Northern Lights 844 / 844L engine, Northern Lights 844L engine
Procedure
- Loosen the current carrying flat wire between the plus-poles of the glow plugs.
- Connect a DC test bulb between the plus-pole of the battery and the plus-pole of the glow plug.
- If the bulb lights up, the glow plug is functioning properly.
- Check all glow plugs and replace any faulty ones.
Tools required
- DC test bulb Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Northern Lights M20C →, Northern Lights M844 →, Northern Lights M844L →, Northern Lights ML844 →, Northern Lights ML844L →, Northern Lights NL844 →
Source: Northern Lights operator'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.