Harddrive Regulator - Black 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 regulator in black is designed for 1981-1988 Harley-Davidson Big Twin V-twin engines. It provides a robust replacement for your original unit, ensuring your charging system operates with optimal efficiency. Riders can expect consistent voltage delivery and improved electrical system longevity.
Why riders pick this
- Black finish for 1981-1988 Harley Big Twin
- Meets or exceeds OEM specifications
- SCR technology for cooler, efficient charging
- Sealed, high-temperature encapsulation
- OEM-grade wiring harness for durability
Keep your 1981-1988 Harley Big Twin running strong with this Harddrive black regulator. It's an essential component for maintaining a healthy electrical system, preventing issues like overcharging or undercharging that can damage your battery and other critical parts. This regulator is built to meet or exceed OEM specifications, offering a dependable and durable solution for your V-twin.
Optimized Charging System Performance
- Meets or exceeds OEM specifications for reliable function
- Silicon Controlled Rectifier (SCR) technology ensures cooler operation
- Sealed high-temperature encapsulation protects internal components
- Surface-mount circuit board design minimizes thermal impedance
- Includes OEM-grade high-temperature wiring harness for secure connections
A Solid Upgrade for Your Big Twin
For Harley Big Twin owners from 1981-1988, this Harddrive black regulator offers a significant upgrade in reliability and performance. Whether you're replacing a worn-out stock unit or aiming for a more robust electrical setup, this regulator provides the consistent power your bike needs. Its sleek black finish also blends seamlessly with most motorcycle aesthetics.
Specifications
- Brand: Harddrive
- Manufacturer Part #: H1686
- OEM Part Reference: 74516-86
- UPC: 191361170041
- Length: 5.2 in
- Width: 5.1 in
- Height: 3.3 in
- Weight: 0.85 lbs
- Country of Origin: China (Mainland)
Common questions
What OEM part number does this Harddrive regulator replace?
This Harddrive regulator is designed to meet OEM Harley-Davidson part number 74516-86 specifications.
Will this fit my 1979 Big Twin?
This part is specifically for 1981-1988 Big Twin models. Older 1979-1980 Harleys use a different regulator design, so it would not be compatible.
What are the benefits of the SCR technology?
The Silicon Controlled Rectifier (SCR) technology allows for cooler and more efficient operation, contributing to a more stable charging system and longer battery life.
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 | 820-60126 |
| WEIGHT | 0.85 lb |
