12v Engine Voltage Regulator



AVR Voltage Regulator at Generator Parts World

This is a 12v Engine Voltage Regulator

This is for a 12v Engine Voltage Regulator. This voltage regulator is most commonly mounted externally on the engine and used in the 12v charging system. This voltage regulator is used to regulate the voltage that is used to charge your battery and the voltage that engages your starter. It is most commonly found on remote start diesel engine generators but it is also used on many other types of small equipment.

This AVR has a total of 3 wires. 2 wires run into a T style plastic connection plug with blades that are turned opposite directions. The other wire has a single female connection. Sold older versions of this part have 4 wires instead of 3. The 4th wire is often a black wire with a eyehole connector. That wire is a ground wires that was needed on the older styles of this part. Our modern day part is internally grounded through the case so the 4th wire is not needed on any unit.

If your battery is not holding charge and the battery has tested good this part is the most likely issue. We do suggest testing the battery when trying to locate the reason for it not holding a charge. If you starter is not functioning this part can also be a cause of that issue. If the starter goes bad, you replace the starter, and still have the same issue of the starter not engaging this part is more than likely the issue. Our part has the inline fuse to protect the rest of the electrical system. If you starter has went bad and this part does not have the inline fuse most likely that part is failing and caused the starter to fail. If you voltage regulator does not have an inline fuse we strongly suggest changing the part to one that does.

Due to the cost of a diesel engine starter and the likely circumstance that this part has caused the starter to go bad we sell these parts together. As stated before, if your does not have an inline fuse we strongly suggest changing it for one that does. Buy both parts in a package to get a better price on both parts!


Size: 3″ Long x 2-3/4″ Wide x 1″ Thick
Connection: 2 Bolt
Bolt Hole Type: Slotted
Bolt Hole Spacing: 2-1/2″ on Center
Wires: 3
Electrical Connection: 1 – 2 Blade Plug | 1 – 1 Blade Plug
Inline Fuse: Yes
Voltage Output: 12v

Would you rather buy this item on eBay? Just click the image below!

12v Engine Voltage Regulator from Generator Parts World on eBay!

All parts are universal parts and are not intended to be represented as OEM parts but represented as parts that are direct replacement parts for specific brands and models, including but not limited to generators and other small engine powered equipment. Generator Parts World will offer a 90 replacement warranty of any part purchased from us under our 90 day replacement policy

Additional information


Universal 12v Engine AVR





Electrical Connection

2 Wire T plug and Single Female Connection Wire

Mounting Bolt Connection

2 Slotted Bolt Holes 2-1/2" from Center to Center


Internally Grounded

Inline Fuse


Shipping Info

All orders will ship from one of our locations within the US, most commonly from Missouri. All orders ship next business day after cleared payment. Business days are Monday through Friday with the exception of holidays.

Our 2 Day Express option may use different carriers such as UPS, FedEx, USPS, or Amazon to offer the best delivery time available. The tracking for your order will be uploaded to PayPal and your order details here on our website. If you need your parts as fast as possible explore on of the shipping options detailed below. All estimated delivery dates below are the estimated time it will take to deliver your order once it ships.

Shipping Within the United States

Free Shipping using First Class Mail: 4 to 6 day delivery
USPS Priority Mail Service: 2 to 4 day delivery
USPS Express Service: 1 to 2 day delivery
UPS Ground Service: 1 to 4 day delivery
2 Day Express Service: 1 to 2 day delivery


Shipping Outside the United States

USPS First Class to Canada: Estimated 10 Days

USPS First Class Worldwide: Estimated 14 to 21 Days


In October of 2021 USPS slow mail delivery on First Class Mail and other services. Please be aware of possible delays by all carriers at peak times such as holidays. Below are some links that can be helpful in identifying delivery times to your location, holiday schedules, and possible delays by the 2 most common carriers we use, USPS and UPS.

USPS Service Alerts

USPS Holiday and Event Schedule

UPS Service Alerts

UPS Holiday Schedule

UPS Ground Shipping Time Map

You may also like…