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Alternators & Stators (Tohatsu)

Alternator Assembly 399-06023-1

Brand: Tohatsu

SKU: 399-06023-1

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The Genuine Tohatsu 399-06023-1 Alternator Assembly is designed for selected 4HP, 5HP and 6HP 2-stroke and 4-stroke outboard motors. Rated at 12V 60W, it generates electrical power for compatible lighting and battery-charging systems when connected to the appropriate electrical components. Ideal for replacing damaged or faulty charging coils, this genuine OEM component helps restore reliable electrical output and supports the operation of compatible marine electrical accessories.

Key benefits

Key Benefits

  • - Genuine Tohatsu OEM alternator assembly.
  • - Factory-rated 12V, 60W electrical output.
  • - Suitable for selected 4HP–6HP outboards.
  • - Compatible with specified 2-stroke and 4-stroke models.
  • - Provides electrical power for compatible lighting and charging systems.
  • - Designed to fit the corresponding factory alternator mounting arrangement.
  • - Suitable for replacing damaged or faulty charging coils.
  • - Ideal for restoring the original optional electrical system.

Specifications & Dimensions

  • - Manufacturer: Tohatsu
  • - OEM Part Number: 399-06023-1
  • - OEM Ordering Number: 399060231M
  • - OEM Description: Alternator (12V 60W)
  • - Product Type: Alternator / Charging Coil Assembly
  • - Rated Voltage: 12V
  • - Rated Power: 60W
  • - Rated Current Equivalent: 5A at 12V (calculated; not a guaranteed regulated charging output)
  • - Engine Type: Selected 2-stroke and 4-stroke
  • - Installation Location: Engine magneto / flywheel assembly

Compatible Tohatsu Outboards

  • 2-Stroke Models
  • - M4C – 4HP
  • - M5B – 5HP
  • - M5BS – 5HP
  • 4-Stroke Models
  • - MFS4A2 – 4HP, 2002 catalogue application.
  • - MFS5A2 – 5HP, 2002 catalogue application.
  • - MFS6A2 – 6HP, 2002 catalogue application.

Compatible Mercury & Mariner Outboards

  • Mercury 2-Stroke
  • - Mercury 4HP – Selected models from 1999 onward.
  • - Mercury 5HP – Selected models from 1999 onward.
  • Mercury 4-Stroke
  • - Mercury 4HP – Selected 1999–2005 models.
  • - Mercury 5HP – Selected 1999–2005 models.
  • - Mercury 6HP – Selected 1999–2005 models.
  • Mariner
  • - Mariner 4HP, 5HP and 6HP – Selected models using the corresponding alternator assembly.

Cross-Reference & Replacement Part Numbers

  • Genuine Tohatsu OEM
  • - 399-06023-1 – Current alternator assembly.
  • - 399060231M – Current OEM ordering number.
  • - 399-06023-0 / 399060230M – Superseded alternator.
  • - 369-06023-0 / 369060230M – Earlier superseded alternator.
  • The earlier OEM numbers are identified in genuine-parts distributor supersession records.
  • Mercury & Mariner OEM Cross-References
  • - 16074
  • - 16074T
  • - 16837A2

Signs the Alternator Needs Replacing

  • - No Charging Output: Electrical system fails to receive the expected alternator output.
  • - Low Battery Voltage: Battery does not charge correctly despite a functioning rectifier and wiring.
  • - Intermittent Electrical Output: Charging or lighting performance fluctuates.
  • - Damaged Coil Windings: Visible deterioration or damage to the alternator windings.
  • - Burnt or Overheated Coil: Discolouration, melted insulation or overheating damage.
  • - Corroded Electrical Connections: Severe corrosion affects the coil terminals or leads.
  • - Damaged Wiring: Broken or deteriorated alternator wiring.
  • - Failed Electrical Testing: Alternator does not meet the applicable service-manual electrical specifications.
  • These symptoms may also result from faulty rectifiers, damaged wiring, blown fuses or battery problems.

Important Fitment Information

  • - Confirm the engine model, year and serial number before ordering.
  • - This is a genuine Tohatsu OEM alternator assembly, not an aftermarket replacement.
  • - Check whether the outboard originally had the optional alternator installed.
  • - Confirm compatibility with the existing flywheel and magneto assembly.
  • - The alternator generates electrical power but does not independently provide regulated DC battery charging.
  • - A compatible rectifier and associated wiring may be required for battery-charging applications.
  • - Verify the electrical output requirements of connected accessories.
  • - Inspect the wiring, rectifier, fuse and connections before replacing the alternator.
  • - Follow the manufacturer's service manual for flywheel removal and electrical installation.
  • - Do not assume every 4HP, 5HP or 6HP outboard uses this alternator.

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