Northern Lights — Flashing the fields

Testing & diagnosis · generator / AVR

From a Northern Lights owner's manual covering: 643/673, M643, M673, NL643, NL673. Check it applies to your exact model before use.

Applies to: Northern Lights M643, Northern Lights M673, Northern Lights NL643, Northern Lights NL673, Northern Lights L643 / L673 engine

Procedure

1. If there is no voltage buildup on startup (zero volts measured), the generator may have no residual magnetic field.
2. Disconnect the AVR before flashing fields or it could be ruined.
3. Apply 12 volts DC to terminals K (-) and J (+) as indicated.
4. Reconnect AVR and check voltage buildup.

Full service-parts list: Northern Lights M643 →, Northern Lights M673 →, Northern Lights NL643 →, Northern Lights NL673 →

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.

More Northern Lights repair guides →