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190 Amp Yanmar kits

240 Amp kit for Yanmar

330 Amp kit for Yanmar

190 Amp Yanmar belt kit

Fast Flow emergency bilge pump- Amazing flow

Inexpencive three step regulator

Marine books by
Scott Fratcher

Fast Flow emergency bilge pumps

ElectroMaax battery chargers

Fast charge rates

Inexpencive universial regulators


Yanmar alternator upgrades

Yanmar 3JH4. 4JH4, 3HJ3, 4JH3, & 3GM30 Serpentine Conversion Kit

This serpentine pulley and belt conversion kit is designed to fit the *Yanmar 3JH4, 4JH4 3JH3, 4JH3 & 3GM30 marine engines*, using our "Aquamaax"line of Saddle Mount alternators 80amp thru 190amp.

Boat owners are now no longer limited to upgrading their old alternator to a 100amp alternator on a single V pulley with this kit you can now increase the output up to 190amps if required.

Electromaax's serpentine conversion kits are designed and manufactured to replaces the conventional narrow single-V belt with a serpentine 10-rib belt, increasing performance and reducing vibration.


Yanmar Serpentine Conversion Kit Features:

  • Wide serpentine 10-rib belt – Smooth (large improvement over dual V-belt, including reduced harmonic vibration), better traction for improved output and less tension required.
  • Anodized 6061 machined aluminum parts, providing exact fit and tolerances – corrosion prevention and lightweight.
  • High grade steel (grade 8 and class 10.9) nuts, bolts, plated for corrosion prevention


We fit most production boats

Beneteau 43 use a JH4 reverse mount with a large frame Delco
Beneteau 47 and Beneteau 50 alternator upgrade use a JH4-TE reverse mount with a large frame Delco
Hanse yachts use an pulley kit
Hanse yachts with a YM30 use a pulley kit, or a YM30 second alternator kit.
Jeanneau yachts tend to use a reverse mount to the Yanmar engine, but can also use a pulley kit
Norsman 447 use a 4JH4-TE reverse kit
Lagoon and other cats use a forward facing kit

Email with your boat's details for more information



*May fit other Yanmar engines Please contact us For More Information

Need a well thought out economical three step regulator? Check out the Electro Maax regulator here.


Want more amperage? Limited space? Check out our Yachtwork line of second alternator kits here.


Tight on space? Can only fit one alternator but still want the big amperage? Try one of our Electro Maax pulley kits here.




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