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 incorporates internal fixed-voltage regulation while supporting Balmar external P-Type regulation, with a Max Charge regulator required for this higher-voltage application. The K6 serpentine pulley suits compatible multi-rib belt 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 internal fixed-voltage regulation while retaining compatibility with Balmar external charging regulation.
  • External regulation required: A compatible Max Charge regulator kit is required for this higher-voltage alternator application.
  • Single-foot spindle mounting: Supports common Motorola- and Delco-style marine engine alternator mounting arrangements.
  • K6 serpentine pulley: Configured for compatible multi-rib serpentine belt drive systems.
  • Isolated ground: Uses a dedicated ground terminal to electrically isolate the alternator case from the charging circuit.
  • Dual internal fan cooling: Provides internal airflow to manage alternator temperature 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 engine tachometer systems.
  • Flexible tensioning: Multi-position crown-style tensioning arm mount assists installation across compatible engine configurations.
  • Marine ignition protection: Meets specified marine ignition-protection and electrical compliance standards.

Combining a K6 serpentine drive, compact spindle mounting and isolated grounding, the alternator suits compatible higher-voltage recreational marine charging systems. Its external regulation capability supports controlled charging for battery banks requiring dedicated multi-stage management.

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 K6 Serpentine
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 K6 Serpentine Pulley 175 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-K6
Model # 621-24-70-K6
UPC/EAN 676205750837
Brand Balmar
Shipping Weight 6.3600kg
Unit Of Measure ea

2 years

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