Harddrive Regulator - Chrome for 1981-1988 Harley Big Twin
About Harddrive
Harddrive is the house performance and replacement line built for American V-twins, covering everything from engine hardware and electrical to controls, lighting and chassis parts. The range is aimed squarely at Harley-Davidson and Indian riders who want a direct-fit part without dealer pricing, and it spans decades of model years — from Evolution-era Softails to current Milwaukee-Eight baggers.
This Harddrive chrome regulator is engineered for 1981-1988 Harley-Davidson Big Twin motorcycles. It provides a reliable and stylish replacement for your original unit, ensuring your charging system operates with precision. Riders can expect consistent voltage regulation and improved electrical system longevity from this robust component.
Why riders pick this
- Chrome finish for 1981-1988 Harley Big Twin
- Meets or exceeds OEM specifications
- SCR technology for cooler, stable voltage
- Sealed, high-temperature encapsulation
- Improved heat dissipation circuit board
- OEM-grade wiring harness
Keep your 1981-1988 Harley Big Twin's electrical system in top condition with this Harddrive chrome regulator. Designed to meet or exceed OEM specifications, this unit is crucial for maintaining proper battery charge and protecting all your motorcycle's electronics. Its advanced SCR technology ensures cooler operation and more stable voltage, which is vital for the demanding electrical needs of a performance V-twin.
Optimized Charging and Durability
- Meets or exceeds OEM specifications for a direct fit
- High-power SCR (Silicon Controlled Rectifier) design for cooler, more stable voltage
- Sealed, high-temperature encapsulation protects against environmental factors
- Late-technology surface mount circuit board for improved heat dissipation
- Equipped with an OEM-grade high-temperature wiring harness
Enhance Your Big Twin's Electrical System
A dependable voltage regulator is fundamental to the reliable operation of your 1981-1988 Harley Big Twin. This Harddrive chrome regulator not only delivers superior electrical performance but also adds a clean, custom look to your bike. It's an excellent choice for replacing a failing stock unit or for riders seeking to upgrade to a more robust and visually appealing charging solution.
Specifications
- Brand: Harddrive
- Manufacturer Part #: H1686C
- OEM Reference: 1981-1988 Harley Big Twin 74516-86
- UPC: 191361170058
- Weight: 1.3893 lbs
- Country of Origin: China (Mainland)
Common questions
Will this fit my 1979 or 1980 Harley Big Twin?
No, this regulator is specifically designed for 1981-1988 Harley Big Twin models. Earlier bikes may require different OEM part numbers; please confirm fitment with your dealer.
What does the SCR design do?
The Silicon Controlled Rectifier (SCR) circuitry allows for cooler and more efficient operation, which helps maintain stable voltage and extends the lifespan of your battery and electrical components.
Is this regulator a direct OEM replacement?
Yes, it is designed as a direct replacement for OEM part number 74516-86 on 1981-1988 Harley Big Twin models.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Harddrive |
| TYPE | Electrical |
| SKU | 820-60127 |
| WEIGHT | 1.39 lb |
