Harddrive Regulator - CHR Bigtwin 1981-1988 74519-88a NON-EFI — Harley-Davidson (1989-1999)

Harddrive regulator for Harley-Davidson Big Twin models 1981–1988 with carbureted engines. This sealed, high-temperature SCR-based regulator meets or exceeds OEM specifications and runs cooler than stock units.

Features

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

Specifications

• Brand: Harddrive
• Manufacturer Part #: H1988C
• UPC: 191361170034
• Dimensions: 4.9 in L × 3.8 in W × 2.6 in H
• Weight: 1 lbs
• Country of Origin: China (Mainland)

Fitment

Fits Harley-Davidson Big Twin models 1981–1988 with carbureted (non-EFI) engines.

Frequently Asked Questions

Will this regulator fit my 1989+ Harley Big Twin?

No — this part is for 1981–1988 carbureted Big Twins. Later fuel-injected models require a different regulator.

Is this a direct replacement for the stock regulator?

Yes. It bolts in place of the OEM unit and uses the same wiring harness connections.

Why does Harddrive use an SCR instead of a standard rectifier?

SCR technology runs cooler and more efficiently than traditional rectifiers, extending the regulator's lifespan and improving charging reliability.

What does 'sealed encapsulation' mean?

The electronics are potted in a heat-resistant, moisture-resistant compound that protects internal components from corrosion and environmental damage.