The M673LD3 Northern Lights Marine Generator: .
5 kW @ 60 Hz / 1800 rpm | 4.5 kW @ 50 Hz 1500 rpm


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Ask to see most company’s 5kW marine
generator sets, and you’ll likely see a light,
fairly disposable machine, seemingly built as
an afterthought.
Not Northern Lights. Our 5kW M673LD3
is built with the careful engineering and
meticulous craftsmanship that has defi ned
every Northern Lights product for over fi fty
Northern Lights starts with a heavy duty
base engine. Then our unique marinization
process creates a machine specifically
designed for the unforgiving rigors of
the marine environment. Adding a sturdy
generator end creates the most reliable,
durable and simple to use marine power
solution on the market.
The M673LD3 is designed for unmatched
reliability. By achieving 5 kilowatts at 1800,
instead of 3600 rpm, the revolutions are cut in
half. Piston and cylinder wear is minimized.
The generator’s automatic voltage
regulator (AVR) is powered by an auxiliary
AC stator winding that isolates it from the
main windings. This ensures that the AVR
has clean power to provide excitation for
faster load response. Whether running the
refrigerator, air conditioner, or any other
accessory, the M673LD3 can make power
dips and surges a thing of the past.
Comfort is always a consideration when
it comes to Northern Lights generator power.
The M673LD3 is built on a balanced three
cylinder diesel. Four plateform isolation
mounts reduce vibration transmission even
The Sound Maze air intake system
is another Northern Lights innovation
developed with your comfort in mind. Air
enters through a molded rubber hose and an
acoustic dampening chamber. This allows for
clear air fl ow, with a minimal noise signature.
For even greater sound attenuation, your
M673LD3 can be equipped with our state of
the art sound enclosure.
Because the M673LD3 meets all current
USEPA Tier III emission standards, you can
rest assured that your 5kW will be as clean
as it is quiet and effi cient.




Enclosure Package is 23% smaller than previous design!

M673L3 shown here with optional sound enclosure

Cylinders: 3 inline
Bore: 2.6 in (67 mm)
Stroke: 2.8 in (72 mm)
Displacement: 46.4 cid (0.76 ltr)
Fuel System: Mechanical
Aspiration: Natural
Length: 28.5 in (724 mm)
Width: 19.5 in (495 mm)
Height: 20.1 in (510 mm)
Weight: 377 lbs (171 kg)
Enclosure Length 28.5 in (724 mm)
Enclosure Width 19.5 in (495 mm)
Enclosure Height 20.8 in (528 mm)
Enclosure Weight 44 lbs (20 kg)
Information, specifications, materials and dimensions subject to change without notice.


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