Marine Alternator with Single-Foot Mount and Serpentine Drive

The Balmar marine alternator provides a compact charging solution for recreational vessels using Motorola- or Delco-style single-foot spindle mounting. Smart Ready technology provides internal fixed-voltage regulation while maintaining compatibility with Balmar external regulation, which is required for this higher-voltage application. The J10 serpentine pulley suits compatible multi-rib belt drive systems, while dual internal fan cooling, sealed heavy-duty bearings and case-isolated grounding support sustained marine charging operation.

Key Features

  • Smart Ready technology: Incorporates an internal fixed-voltage regulator while supporting Balmar external P-Type regulation.
  • External regulation required: This higher-voltage configuration requires a compatible Max Charge regulator system for charging control.
  • Single-foot spindle mounting: Supports common Motorola- and Delco-style marine engine alternator mounting arrangements.
  • J10 serpentine pulley: Configured for compatible multi-rib serpentine belt drive systems.
  • Isolated ground: Dedicated ground terminal electrically isolates the alternator case from the charging circuit.
  • Dual internal fan cooling: Provides airflow through the alternator to manage heat during sustained charging.
  • Marine construction: Ventilated cast aluminium housing, high-impact plastic rear cover and sealed heavy-duty radial bearings support marine installations.
  • Tachometer connection: Stator output is available through the pigtail connection for compatible tachometer systems.
  • Flexible tensioning: Multi-position crown-style tensioning arm mount assists installation on compatible engine configurations.
  • Marine ignition protection: Meets specified marine ignition-protection and electrical compliance standards.

Combining a J10 serpentine drive, spindle mounting and isolated grounding, the alternator supports compatible higher-voltage recreational marine charging systems. Its external regulation capability allows charging to be managed according to the requirements of the connected battery bank.

Product Type Marine Alternator
Alternator Series 621 Series
System Voltage 24 V
Alternator Output 70 A
Power Take-Off 5.6 HP
Alternator Style Small Case, Positive Field Excitation (P-Type)
Mounting Configuration 1–2 in Single-Foot Spindle Mount
Mounting Style – 1 in Foot Motorola Style
Mounting Style – 2 in Foot Delco Style
Mounting Foot Bore – 1 in Foot 1/2 in
Mounting Foot Bore – 2 in Foot 3/8 in
Pulley Configuration J10 Serpentine
J10 Pulley Width 30 mm
Regulation External P-Type or Internal Smart Ready Fixed Voltage Regulator
External Regulator Requirement Max Charge Regulator Kit Required for 24 V Applications
Internal Voltage Regulation 28.2 V
Cooling Dual Internal Fans
Bearings Sealed Heavy-Duty Radial, Front and Rear
Case Construction Ventilated Cast Aluminium
Rear Cover High-Impact Plastic
Finish White Powder Coat
Grounding Dedicated Terminal, Case Isolated
Positive Output Threaded Stud, M8 × 1.25
Ground Stud M8 × 1.25
Lamp Output D+ Low Voltage / Low Current, 10 × 24 Stud
AC/Stator Output 12 Pulse, Stator Output Wire Included in Pigtail Plug
Diodes 3 Positive / 3 Negative, 50 A Rated
Tensioning Arm Mount Five-Position Crown, M8 × 1.25
Low RPM Cut-In 1,320 rpm
Maximum Alternator Speed 15,000 rpm
Normal Operating Temperature 82 °C
Maximum Operating Temperature 108 °C
Case Diameter 136 mm
Crown Width 102 mm
Bolt-to-Bolt Centre 167 mm
Overall Height 190 mm
Case Length Front-to-Back 129 mm
Overall Length with J10 Serpentine Pulley 181 mm
Case Rear to Foot – 1 in Foot 94 mm
Case Rear to Foot – 2 in Foot 65 mm
Foot Width – 1 in Configuration 25 mm
Foot Width – 2 in Configuration 51 mm
Ignition Protection USCG Title 33, ISO J1187, CE, SAE 8846
Application Recreational Marine Battery Charging Systems
SKU BAL.621-24-70-J10
Model # 621-24-70-J10
UPC/EAN 676205751209
Brand Balmar
Shipping Weight 6.3600kg
Unit Of Measure ea

2 years

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