Mopar Performance P3690731 voltage regulator

[Greg Gay]

My father has a 1966 Plymouth, converted to Mopar electronic ignition. We believe that the car has previously been raced, but he drives it on the street. It has the above voltage regulator on it, and he thinks the battery went bad way to quickly. I researched this on another site. A third of the people say this is a drag race only item, a third say it is fine to use on the street, as long as you ground it, and the last third claim to have used it on the street for years. Can I get some advice on this?

Thanks,

Greg

[James L Miller]

You can get a stock replacement voltage regulator for the 1970-1980s cars like a Standard Motor Products VR-125. They seem to be reliable if it is wired correctly.

https://www.summitracing.com/search/...dge/model/dart

[GTX JOHN]

Greg: I believe that # is "Constant Charge" voltage regulator is a race piece.

If you drive it on the street for extended periods of time...It will severely

shorten the life of the battery. It inputs full output of the alternator's

available amps into the battery and literally boil it to Death after a period

of time on the road!

[Steve Stasko]

John is correct here.

You need to use a 1966 replacement regulator with that setup. The Mopar instructions for the electronic ignition kits are very poor for the earlier cars. I just went through this a few years ago with my '65 Coronet. The part number you need is a Wells VR706. It's actually a modern style retrofit with a circuit board instead of the wire coil and point design.

[340Cuda]

They are for sale on Amazon and this is the description:

"To ensure your ignition and electrical systems can provide maximum. performance, install a Mopar constant output voltage regulator. Voltage is held at a constant 13.5 volts. For race applications only. Mopar parts and accessories are engineered and built specifically for your vehicle providing the precise fit, finish and quality you can always expect from Mopar to keep your vehicle looking and running its best."

[Greg Gay]

Thank you, everyone. This is not the first thing that we have found on this car that has been "less than ideal". Still, it's a fun car!

[Greg Gay]

I can't find a Wells RV706. Is the Echlin VR32 an acceptable replacement?

[FED 387]

Wells VR--VR not RV

[Steve Stasko]

That's a stock replacement with the breaker point inside. It will work, but I can't say for how long. I've had issues with those types from various parts stores. I seem to have better luck with the circuit board one, that's why I recommended it.

[John Dinkel]

Best thing to do is update to a 1970 or newer alternator and the electronic voltage regulator.
Pretty easy to do.