Click here to download the 25HD Troubleshooting Guide.

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POWERLINE 25HD Series Alternators

POWERLINE 25HD series alternators are designed and tested to withstand higher under-hood temperatures and are for vehicles requiring higher output at idle and at highway speeds. Tested for today’s medium and heavy-duty on and off-road applications. This series is available in 160, 220, and 275-amp 12-volt, and 100, 150, and 200-amp 24-volt models.

The POWERLINE 25HD series alternators are perfect for fire trucks, ambulances, buses, emergency vehicles, service vehicles, wreckers, motor homes, tow vehicles, off-road vehicles, trucks, and specialty vehicles.



  • Freightliner FL67 and FL70. Navistar 3000 bus chassis and
    4000 truck chassis. All series Monoco Motorhomes. All Detroit, Cummins, Caterpillar, Mack, International, and Mercedes Diesel engines equipped for J-180 mounts. For more application information call HDPSI at (800) 443-9394 or go to on the web for details.


  • Weight: 27 lbs.


  • 12-month limited warranty


  • Mount types available: J-180 and T-mount
  • Amp/volt configurations: 160/12, 220/12, 275/12,
    100/24, 150/24, and 200/24
  • Heavy-duty, 50-amp press-fit diodes (12 positive, 12 negative)
  • Standard with internal adjustable or non-adjustable regulators • External regulator configurations available
  • Hand-wound, heavy-duty dual delta stator
  • Extra long-life brushes
  • Heavy-duty, dual-plane balanced rotor
  • Heavy-duty, extended-life bearings with heat-treated races,
    high-temperature grease and Viton seals
  • Various pulleys and fans to fit your application
  • Externally-rectified models available
  • Insulated ground available upon special order
  • Equipped for remote battery sense and indicator lamp use
  • Shipped ready for one-wire hook-up
  • Easy conversion for battery isolator/Duvac systems
  • POWERLINE custom-braided wiring harness available


  • Extensive heat-chamber testing to withstand the higher under-hood temperatures of heavy-duty applications
  • Maximum amps at engine idle
  • Designed for worst-case, high-temperature operating conditions
  • Natural aluminum finish allows faster heat dissipation
  • Precision-engineered to guarantee the fit of each application
  • Heavy-duty materials provide exceptional performance
    for extended life
  • Troubleshooting Guide and on-call technical support available
  • Application guide available by phone or online at

POWERLINE 25HD Series Alternator Power Curve Performance

25HD Series, 160-Amp, 12-Volt
Click graph to enlarge.
25HD Series, 220-Amp, 12-Volt
Click graph to enlarge.
25HD Series, 275-Amp, 12-Volt
Click graph to enlarge.
POWERLINE 24HD Series Alternator Spindle Mount Specifications

25HD Series, J-180 Mount
Click illustration to enlarge.
245HD Series, J-180 Mount
Click illustration to enlarge.
  HD Power Solutions Inc • 4616 Fairlane Ave • Fort Worth, TX 76119 • Phone: (817) 535-0284 • Fax: (817) 531-2755