VW voltage regulator. The voltage regulator turns the alternator or generator on and off and makes it charge the battery. If the battery is boiling, it is being overcharged and the voltage regulator is definitely bad.
Condition: New
Warranty
All products carry a 100 day warranty. Engines, cylinder heads, and injection pumps carry an extended 12 month warranty. See our warranty page for details.
Do-it-Yourself Tip
If replacing the VW voltage regulator hasn’t solved your battery woes it’s time to replace the alternator. The Bentley manual is the perfect solution for help in hunting down your electronic gremlins. A few popular editions are listed below.