M843NW3 Marine Generator - 12 kW / 10 kW (w/ Sound Enclosure)

M843NW3 Marine Generator - 12 kW / 10 kW (w/ Sound Enclosure)

M843NW3 Marine Generator - 12 kW / 10 kW (w/ Sound Enclosure)

Customer ratings and reviews

Northern Lights Marine Generator M843NW3 12 kW (60Hz) / 10 kW (50Hz). Comes with all the time-tested features you expect on a Northern Lights gen set. Simple, reliable cooling system that minimizes belts, hoses & gaskets. Single side service access. See specs below. *Sound enclosure included. MFG#: M843NW3 SE.

**Contact Us For Limited Time Boat Show Discounts On Our Marine Generators! 1-800-766-5256, or chat with us below!

M843NW3 SE

By buying this product you can collect up to Your cart will total 1694 points that will be converted into a of $169.40 towards your next purchase! Must be to collect points.

More info

The M843NW3 comes with all the time-tested features you expect on a Northern Lights. A simple, reliable cooling system that minimizes belts, hoses and gaskets. A relay based DC electrical system without expensive printed circuit boards. Single side service accessibility.

Northern Lights M843NW3 12 kw marine generator w/ sound enclosure

*M843NW3 shown without sound enclosure.

  • Engine Block
  • Four cycle, 3 cylinder, liquid cooled, naturally aspirated, overhead valve diesel.
  • Swirl combustion chambers improve fuel efficiency and reduce smoke.
  • Glow plugs for quick cold starting.

Cooling System

  • Freshwater cooling system in heat exchanger or keel cooled configuration.
  • One-piece heat exchanger, expansion tank and liquid cooled exhaust manifold. Fewer troublesome hoses and gaskets. Cast iron to resist corrosion and electrolysis.
  • Heat exchanger cooling is standard. Cupro-nickel tube-type heat exchanger has removable ends for easy cleaning. Rubber impeller seawater pump of bronze and stainless steel is gear driven; no belt.

Fuel System 

  • Fuel system is self-venting.
  • Injection pump with 5% mechanical governor for close AC frequency control.
  • Pintle injectors with replaceable tips.
  • Mechanical lift pump with hand primer. No electric pump to fail.
  • Large spin-on fuel filter.
  • Flexible fuel lines routed to fuel manifold.
  • Stop solenoid controls the fuel rack, not the throttle, to eliminate speed variances and linkage problems.

Intake and Exhaust 

  • Meets US EPA Tier III emission standards at date of manufacture.
  • Washable air cleaner in cast intake manifold reduces intake noise.
  • Cast iron, wet exhaust elbow for safety.

Lubrication System 

  • Full flow, spin-on oil filter with bypass.
  • 4.2 qt (4 ltr) oil capacity for better lubrication. 200 hour oil change intervals.
  • Oil drain for quick, clean oil changes.
  • Closed crankcase vent system traps oil vapor and keeps engine room clean.
  • DC Electrical System

    • DC system uses reliable relays instead of an unrepairable printed circuit board.
    • 12 volt starter motor and battery charging alternator with regulator and belt guard.
    • Standard panel: Remote mount S-1B has hour meter, stop-start switch with run light and preheat switch.
    • Expandable to six panels up to 110 feet from the set.
    • 20 foot (6m) plug-in panel harness lets you mount your panel anywhere onboard. Better than inaccessible unit mount panels that are prone to vibration problems.
    • Low oil pressure, high coolant temp and high exhaust temp safety shutdowns standard.
    • AC Generator

      • Northern Lights, direct coupled, brushless AC generator is maintence free. 4 lead, 1 phase, 50 or 60 Hz output standard. 12 lead, 3 phase optional. Conservative heat rise rating: 95oC/50oC ambient.
      • Automatic voltage regulator (AVR) is powered by dedicated AC winding for true 300% short circuit capability and circuit breaker protection. Quick ±1% RMS no load to full load voltage regulation.
      • Generator features high quality, Class “H” epoxy insulation, accessible diodes, over-sized bearings and junction box for wiring.
Sound Enclosure
    • The highest performing enclosures in the industry, Northern Lights sound shields are designed and tested to attenuate up to 20 dBA
      Trigger latch panels open to single-side serviceability and their white, powder-coated finish is as durable as it is elegant.
      This item is a genuine Northern Lights part shipped with a 6 month factory warranty 

M843NW3 specifications

Special Equipment

  • Welded steel base frame with drip pan.
  • Four plateform mounts isolate vibration.
  • White, long-life polyurethane paint.
  • Operator’s and parts manuals standard.


60 Hz @ 1800 rpm12 Kw
50 Hz @ 1500 rpm10 Kw
Cylinders:3 inline
Bore:3.3 in (84 mm)
Stroke:3.5 in (90 mm)
Displacement:91 cid (1.5 ltr)
Fuel System:Mechanical
Length:39.4 in (1000 mm)
Length with Enclosure:39.4 in (1000 mm)
Width:22.8 in (580 mm)
Width with Enclosure:22.8 in (580 mm)
Height:25.2 in (641 mm)
Height with Enclosure:25.7 in (654 mm)
Weight:837 lbs (380 kg)
Weight with Enclosure:912 lbs (414 kg)