1. Electrical & Ignition Components Offered
  2. sku: 8747262445091861
  3. COMPU FIRE 55500

COMPU-FIRE 55500 Compufire Big Amplifier Charging 40-AMP 29957-81B 40CHARGING

fits model: Twin. make: Harley, Davidson.

29957-81b Compu-fire 55500 Compufire Harley Davidson Big Twin Chrome 40 Amp Charging System

( Brand: Compu-fire ), ( Part Type: Amplifier ), ( Compatible Make: Harley Davidson ), ( Oe/oem Part Number: 29957-81b ), ( Manufacturer Part Number: 55500 ), ( Country Of Origin: United States )

Review COMPU FIRE Compufire Harley Davidson Big Chrome 40charging System fits TWIN

The Compu-Fire Big Twin 40 Charging System by Compu-Fire is a high-performance charging solution designed specifically for Harley-Davidson motorcycles. This charging system, model number 55500, is a 40-amp unit that delivers superior charging capabilities to keep your Harley-Davidson battery healthy and your bike running at its best.

The Compu-Fire 55500 features a state-of-the-art charging algorithm that automatically adjusts voltage and current output based on the battery's condition and temperature. This ensures optimal charging efficiency and extends the life of your battery. The system is also fully automatic, eliminating the need for manual intervention or complex settings.

The Big Twin 40 Charging System is built to be robust and durable, with a heavy-duty construction that can withstand the rigors of regular use. The unit is encased in a weather-resistant enclosure, protecting it from the elements, and features a convenient carrying handle for easy transportation.

The Compu-Fire 55500 is compatible with a wide range of Harley-Davidson models, including those with the 40-amp charging system requirement, such as the Softail, Dyna, Touring, and V-Rod models. It is also designed to work seamlessly with Harley-Davidson accessories, including heated grips, auxiliary lights, and other electrical components.

The charging system comes with a variety of output modes, including 12-volt DC and 14.4-volt DC, to accommodate different battery types and charging requirements. It also features a diagnostic display, which provides real-time information on charging status, voltage levels, and other important parameters.

The Compu-Fire Big Twin 40 Charging System is easy to install, with a simple wiring harness that can be connected to your bike's electrical system. The system also includes a convenient mounting bracket, which allows for secure and stable installation on your motorcycle.

In summary, the Compu-Fire Big Twin 40 Charging System is a high-performance, automatic charging solution designed specifically for Harley-Davidson motorcycles. It delivers superior charging capabilities, with a robust and durable construction, and is compatible with a wide range of Harley-Davidson models and electrical components. With its easy installation and convenient features, the Compu-Fire 55500 is an essential accessory for any Harley-Davidson rider.

The Compu-Fire 55500 and the Harley-Davidson 29957-81B are two different charging systems designed specifically for Harley-Davidson motorcycles. Let's take a closer look at each charging system and discuss their pros and cons to help you make an informed decision.

Compu-Fire 55500 Charging System: Pros:

1. High Output: With a 5-amp regulator, this charging system can deliver up to 4.33 amps to the battery, making it a good choice for riders who frequently use their motorcycle's electrical systems.

2. Convenient: The Compu-Fire 55500 comes with a built-in voltage regulator, eliminating the need for an additional component.

3. Durable Design: This charging system is designed to withstand harsh environments and is resistant to corrosion.

4. Easy Installation: The plug-and-play design makes it easy for riders to install the charging system themselves.

Cons:

1. Size: The Compu-Fire 55500 is larger than the OEM charging system, which may not be ideal for riders who prioritize a sleek appearance.

2. Cost: Compared to the OEM charging system, the Compu-Fire 55500 is more expensive.

Harley-Davidson 29957-81B Charging System: Pros:

1. Original Equipment: This OEM charging system is a direct replacement for the stock Harley-Davidson charging system, ensuring a perfect fit and reliable performance.

2. Compact Design: The Harley-Davidson 29957-81B is smaller in size compared to the Compu-Fire 55500, making it a better option for riders who prioritize a clean and streamlined look.

3. Affordable: This charging system is typically less expensive than aftermarket alternatives.

Cons:

1. Lower Output: With a 3-amp regulator, this charging system may not be able to deliver as much power to the battery as some aftermarket alternatives.

2. Limited Features: The Harley-Davidson 29957-81B does not offer any additional features beyond basic charging functionality.

Conclusion:

Both the Compu-Fire 55500 and the Harley-Davidson 29957-81B have their strengths and weaknesses. If you prioritize high output and convenience, the Compu-Fire 55500 may be the better choice. However, if you prefer a direct OEM replacement, a compact design, and a lower cost, the Harley-Davidson 29957-81B is worth considering.

Recommendation:

Ultimately, the decision comes down to your personal preferences and priorities. If you frequently use your motorcycle's electrical systems and want a high-output charging system, the Compu-Fire 55500 is a solid choice. Alternatively, if you prefer an OEM replacement and a compact design, the Harley-Davidson 29957-81B is a reliable and affordable option.

specifications ignitioncompo:

  • for models: Twin
  • for makes: Harley, Davidson
  • brand: Compu-fire
  • part type: Amplifier
  • compatible make: Harley Davidson
  • oe/oem part number: 29957-81b
  • manufacturer part number: 55500
  • country of origin: United States

seller ignitioncompo:

  • # reviews: 780
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  • started: February 26, 2026
  • quantity: 1
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general ignitioncompo:

  • condition: New other see details
  • Motorcycle Scooter Parts Accessories > Electrical Ignition Components > Other Electrical Ignition Components

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for models: twin, for makes: harley, davidson, part type: amplifier, compatible make: harley davidson, oe/oem part number: 29957-81b, country of origin: united states,
category: motorcycle parts > motorcycle scooter parts accessories > electrical ignition components, sku: 8747262445091861,

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