Twin Power 08-17 FXST FLST Voltage Regulator Black — Fits Harley-Davidson

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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About TwinPower

TwinPower engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full TwinPower lineup with fast shipping and expert fitment support — order with confidence.

Twin Power Black Voltage Regulator for Harley-Davidson FXST & FLST Models (2008-2017)

Maintain the integrity of your Harley-Davidson's electrical system with this essential Black Voltage Regulator from Twin Power. Designed as a direct replacement for Harley-Davidson part number 74540-08, this 40 Amp regulator ensures consistent power delivery, keeping your battery properly charged and all your motorcycle's electronics functioning smoothly. Its sleek black finish offers a subtle, clean look.

Key Features & Benefits:

  • Exact Fit: Replaces H-D# 74540-08 for a hassle-free installation on compatible models.
  • Reliable Performance: Built to Twin Power's high standards for dependable operation.
  • Stealthy Black Finish: Complements a variety of custom aesthetics.
  • 40 Amp Output: Sufficient amperage to handle the electrical demands of your ride.
  • Extensive Fitment: Covers a wide range of Harley-Davidson FXST and FLST motorcycles from 2008 through 2017, including popular models like Heritage Softail Classic, Fat Boy, Fat Boy Lo, Cross Bones, Rocker, Rocker C, Blackline, CVO Softail Convertible, and Softail Custom.

Vehicle Compatibility:

This voltage regulator is compatible with the following Harley-Davidson models:

  • 2008-2017 FLSTC Heritage Softail Classic
  • 2008-2017 FLSTF Fat Boy
  • 2010-2017 FLSTFB Fat Boy Lo
  • 2014-2015 FLSTNSE CVO Softail Deluxe
  • 2008-2011 FLSTSB Cross Bones
  • 2010-2012 FLSTSE CVO Softail Convertible
  • 2008-2009 FXCW Rocker
  • 2008-2011 FXCWC Rocker C
  • 2011-2013 FXS Blackline
  • 2013-2014 FXSBSE CVO Breakout
  • 2008-2009 FXSTB Night Train
  • 2008-2010 FXSTC Softail Custom

Don't let a faulty regulator leave you stranded. Ensure your electrical system is in top shape with this Twin Power Black Voltage Regulator from GGCRACING!

Vehicle Fitment

Years Make Model Trim
2008-2017 Harley-Davidson FLSTC Heritage Softail Classic Base
2008-2017 Harley-Davidson FLSTF Fat Boy Base
2010-2017 Harley-Davidson FLSTFB Fat Boy Lo Base
2014-2015 Harley-Davidson FLSTNSE CVO Softail Deluxe Base
2010-2012 Harley-Davidson FLSTSE CVO Softail Convertible Base
2008-2009 Harley-Davidson FXCW Rocker Base
2008-2011 Harley-Davidson FXCWC Rocker C Base
2011-2013 Harley-Davidson FXS Blackline Base
2013-2014 Harley-Davidson FXSBSE CVO Breakout Base
2008-2010 Harley-Davidson FXSTC Softail Custom Base

Product Details

Product Description
Part Numbers
Sizing & Fit

About TwinPower

TwinPower engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full TwinPower lineup with fast shipping and expert fitment support — order with confidence.

Twin Power Black Voltage Regulator for Harley-Davidson FXST & FLST Models (2008-2017)

Maintain the integrity of your Harley-Davidson's electrical system with this essential Black Voltage Regulator from Twin Power. Designed as a direct replacement for Harley-Davidson part number 74540-08, this 40 Amp regulator ensures consistent power delivery, keeping your battery properly charged and all your motorcycle's electronics functioning smoothly. Its sleek black finish offers a subtle, clean look.

Key Features & Benefits:

  • Exact Fit: Replaces H-D# 74540-08 for a hassle-free installation on compatible models.
  • Reliable Performance: Built to Twin Power's high standards for dependable operation.
  • Stealthy Black Finish: Complements a variety of custom aesthetics.
  • 40 Amp Output: Sufficient amperage to handle the electrical demands of your ride.
  • Extensive Fitment: Covers a wide range of Harley-Davidson FXST and FLST motorcycles from 2008 through 2017, including popular models like Heritage Softail Classic, Fat Boy, Fat Boy Lo, Cross Bones, Rocker, Rocker C, Blackline, CVO Softail Convertible, and Softail Custom.

Vehicle Compatibility:

This voltage regulator is compatible with the following Harley-Davidson models:

  • 2008-2017 FLSTC Heritage Softail Classic
  • 2008-2017 FLSTF Fat Boy
  • 2010-2017 FLSTFB Fat Boy Lo
  • 2014-2015 FLSTNSE CVO Softail Deluxe
  • 2008-2011 FLSTSB Cross Bones
  • 2010-2012 FLSTSE CVO Softail Convertible
  • 2008-2009 FXCW Rocker
  • 2008-2011 FXCWC Rocker C
  • 2011-2013 FXS Blackline
  • 2013-2014 FXSBSE CVO Breakout
  • 2008-2009 FXSTB Night Train
  • 2008-2010 FXSTC Softail Custom

Don't let a faulty regulator leave you stranded. Ensure your electrical system is in top shape with this Twin Power Black Voltage Regulator from GGCRACING!

Vehicle Fitment

Years Make Model Trim
2008-2017 Harley-Davidson FLSTC Heritage Softail Classic Base
2008-2017 Harley-Davidson FLSTF Fat Boy Base
2010-2017 Harley-Davidson FLSTFB Fat Boy Lo Base
2014-2015 Harley-Davidson FLSTNSE CVO Softail Deluxe Base
2010-2012 Harley-Davidson FLSTSE CVO Softail Convertible Base
2008-2009 Harley-Davidson FXCW Rocker Base
2008-2011 Harley-Davidson FXCWC Rocker C Base
2011-2013 Harley-Davidson FXS Blackline Base
2013-2014 Harley-Davidson FXSBSE CVO Breakout Base
2008-2010 Harley-Davidson FXSTC Softail Custom Base

Product Details

Product Description

About TwinPower

TwinPower engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full TwinPower lineup with fast shipping and expert fitment support — order with confidence.

Twin Power Black Voltage Regulator for Harley-Davidson FXST & FLST Models (2008-2017)

Maintain the integrity of your Harley-Davidson's electrical system with this essential Black Voltage Regulator from Twin Power. Designed as a direct replacement for Harley-Davidson part number 74540-08, this 40 Amp regulator ensures consistent power delivery, keeping your battery properly charged and all your motorcycle's electronics functioning smoothly. Its sleek black finish offers a subtle, clean look.

Key Features & Benefits:

  • Exact Fit: Replaces H-D# 74540-08 for a hassle-free installation on compatible models.
  • Reliable Performance: Built to Twin Power's high standards for dependable operation.
  • Stealthy Black Finish: Complements a variety of custom aesthetics.
  • 40 Amp Output: Sufficient amperage to handle the electrical demands of your ride.
  • Extensive Fitment: Covers a wide range of Harley-Davidson FXST and FLST motorcycles from 2008 through 2017, including popular models like Heritage Softail Classic, Fat Boy, Fat Boy Lo, Cross Bones, Rocker, Rocker C, Blackline, CVO Softail Convertible, and Softail Custom.

Vehicle Compatibility:

This voltage regulator is compatible with the following Harley-Davidson models:

  • 2008-2017 FLSTC Heritage Softail Classic
  • 2008-2017 FLSTF Fat Boy
  • 2010-2017 FLSTFB Fat Boy Lo
  • 2014-2015 FLSTNSE CVO Softail Deluxe
  • 2008-2011 FLSTSB Cross Bones
  • 2010-2012 FLSTSE CVO Softail Convertible
  • 2008-2009 FXCW Rocker
  • 2008-2011 FXCWC Rocker C
  • 2011-2013 FXS Blackline
  • 2013-2014 FXSBSE CVO Breakout
  • 2008-2009 FXSTB Night Train
  • 2008-2010 FXSTC Softail Custom

Don't let a faulty regulator leave you stranded. Ensure your electrical system is in top shape with this Twin Power Black Voltage Regulator from GGCRACING!

Vehicle Fitment

Years Make Model Trim
2008-2017 Harley-Davidson FLSTC Heritage Softail Classic Base
2008-2017 Harley-Davidson FLSTF Fat Boy Base
2010-2017 Harley-Davidson FLSTFB Fat Boy Lo Base
2014-2015 Harley-Davidson FLSTNSE CVO Softail Deluxe Base
2010-2012 Harley-Davidson FLSTSE CVO Softail Convertible Base
2008-2009 Harley-Davidson FXCW Rocker Base
2008-2011 Harley-Davidson FXCWC Rocker C Base
2011-2013 Harley-Davidson FXS Blackline Base
2013-2014 Harley-Davidson FXSBSE CVO Breakout Base
2008-2010 Harley-Davidson FXSTC Softail Custom Base

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