Standard Ignition VR-406 Voltage Regulator

Charging System Voltage Regulator Overview

Standard Ignition VR-406 is an external 12-volt charging system voltage regulator built for vehicles that use a round female connector and a 5-terminal blade/eye ring interface. It is a direct-fit electrical replacement for select Honda, Isuzu, Geo, Chevrolet, and Suzuki applications, including Honda Civic, Honda CRX, and Isuzu Trooper fitments.

Key Features

• External mounting location for charging system service
• 12-volt voltage regulator design
• 1 round female connector
• 5 male terminals with blade and eye ring terminal types
• Compact housing dimensions: 87.884 x 57.404 x 32.004 mm
• Standard Ignition VR-406 part number for catalog matching and service lookup

Detailed Product Description

Standard Ignition VR-406 is a charging system voltage regulator used to control alternator or generator output in older 12-volt electrical systems. Its external design, round connector shape, and 5-terminal layout make it a practical replacement for vehicles that require this specific electrical configuration. This part number is commonly searched for Honda Civic and Honda CRX charging system repairs, as well as Isuzu Trooper voltage regulator service. This part cross-references R904 and VR575 for the same application.

Compatible vehicle coverage includes Fits 1995 Isuzu Trooper, N/A; Fits 1990-1994 Isuzu Trooper, N/A; Fits 1990-1993 Geo Storm, N/A; Fits 1991-1993 Isuzu Stylus, N/A; Fits 1990-1992 Isuzu Impulse, N/A; Fits 1987-1990 Honda Civic, N/A; Fits 1988-1990 Honda CRX, N/A; Fits 1989 Isuzu I-Mark, N/A; Fits 1985-1987 Isuzu I-Mark, N/A; Fits 1986-1988 Chevrolet Nova, N/A; Fits 1986-1988 Chevrolet Spectrum, N/A; Fits 1988 Isuzu I-Mark, N/A; Fits 1985-1986 Chevrolet Sprint, N/A; Fits 1984-1986 Honda Civic, N/A; Fits 1985-1986 Suzuki Forsa, N/A.

Common Issues This Part May Resolve

• Unstable charging voltage at the battery
• Overcharging or undercharging conditions
• Charging warning light concerns
• Electrical system performance problems tied to regulator failure
• Alternator or generator output control faults

Installation Notes and Tips

Verify the connector style, terminal count, and external mounting location before installation. Compare the existing unit to the VR-406 dimensions and terminal layout to confirm match-up with the vehicle’s charging system. Because hardware, instructions, and mounting brackets are not included, reuse the original mounting components and follow the vehicle service procedure for electrical testing after installation.

Quality Assurance

Standard Ignition supplies this regulator as a service replacement part for specific charging system applications. Confirm fitment by year, make, model, and electrical connector configuration before ordering. The VR-406 is cataloged for direct replacement use in supported Honda Civic, Honda CRX, and Isuzu Trooper applications.