Harddrive Regulator - CHR BIG Twin `1981-1988 OEM 74516-86 — Harley-Davidson Tour Glide Classic, Electra Glide, Electra Glide Classic (1981-1988)

Harddrive regulator for big twin Harley-Davidson motorcycles, 1981-1988. Built to OEM specifications with sealed, high-temperature construction and quality SCR (Silicon Controlled Rectifier) circuitry for cooler, more stable voltage regulation.

Features

• Meets or exceeds OEM specifications
• High-power SCR (Silicon Controlled Rectifier) design
• Sealed, high-temperature encapsulation
• Late-technology surface mount circuit board for improved heat dissipation
• OEM-grade high-temperature wiring harness

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)

Fitment

Fits Harley-Davidson big twin motorcycles, 1981 through 1988 model years. Direct replacement for OEM part 74516-86.

Frequently Asked Questions

Will this fit my 1979 or 1980 Harley big twin?

This regulator is designed for 1981-1988 models. Earlier bikes may use different OEM part numbers — verify with your dealer before ordering.

What does the SCR design do?

The Silicon Controlled Rectifier circuitry allows cooler operation and more stable voltage output under load compared with standard regulators.

Is this a direct bolt-in replacement?

Yes — this regulator meets OEM specifications and uses the original factory wiring harness connection for direct installation.

Why is it sealed?

High-temperature sealed encapsulation protects the internal circuitry from moisture, dirt, and extreme engine heat, extending service life.