Standard Ignition VR-789 Voltage Regulator

Charging System Voltage Regulator for Bosch Alternators

Standard Ignition VR-789 is a 12-volt charging system voltage regulator for alternator-mounted applications. It is built with a male flat connector, a male eye-ring terminal, and included hardware for a direct-fit replacement on select Bosch and Valeo alternator setups.

Use this regulator when servicing charging issues on Audi TT, Audi A4, Volkswagen Passat, and related applications that use the listed alternator configurations. The Standard Ignition VR-789 is sized at 80.518 x 62.738 x 27.94 mm and is intended for alternator mounting.

Key Features

• 12-volt charging system voltage regulator
• Mounts at the alternator
• Male flat connector with 1 connector cavity
• Male eye-ring terminal with 1 terminal connection
• Hardware included for installation
• Compact regulator dimensions: 3.17 x 2.47 x 1.1 inches
• Standard Ignition VR-789 replacement part number

Detailed Description

Standard Ignition VR-789 is a charging system voltage regulator used to control alternator output in select import vehicles. It is listed for a wide range of Audi and Volkswagen applications, including Bosch alternator and Valeo alternator configurations. For fitment-based searches, this part is commonly referenced for 2000-2005 Volkswagen Jetta, 2004-2006 Audi TT, 2002-2004 Audi A4, 2004-2005 Volkswagen Passat, and 2008-2009 Volkswagen Touareg applications with the correct alternator type. The VR-789 part number is also useful when cross-checking replacement needs against OE-style charging system service parts.

This part cross-references 028903803F and VR1021 for the same application.

What It Helps Fix

• Unstable charging voltage at the battery
• Overcharging or undercharging conditions
• Battery warning light related to alternator regulation
• Charging system output fluctuations at idle or under load
• Alternator regulator failure on Bosch or Valeo-equipped vehicles

Installation Notes and Tips

• Confirm alternator brand and configuration before ordering; fitment varies by Bosch and Valeo applications.
• Verify connector style, terminal type, and mounting location against the existing regulator.
• Inspect the alternator and charging circuit for wear, corrosion, or damaged wiring during replacement.
• Instructions are not included, so service information should be referenced during installation.

Quality Assurance

Standard Ignition VR-789 is a replacement charging system voltage regulator from Standard Ignition, a recognized name in electrical and engine management service parts. It is specified for 12-volt systems and application-matched to the listed Audi and Volkswagen fitments.