Genuine Motorcraft GRX-528 Voltage Regulator (NORS)
Ensure steady electrical performance and protect your vintage vehicle's charging system with this genuine Motorcraft GRX-528 Voltage Regulator. This authentic New Old Replacement Stock (NORS) electronic regulator was manufactured in the USA to original equipment standards. It is a critical component for maintaining a consistent 12-volt output from the alternator, preventing overcharging and battery damage. Specifically engineered for a wide range of 1971-1980 vehicles, this unit is essential for 1971-1975 American Motors (AMC) Ambassador, Matador, Hornet, and Gremlin models, 1972-1975 Jeep CJ and Wagoneer series, and 1978-1980 International Scout II applications. Utilizing original-spec Motorcraft components ensures factory-correct electrical calibration and mounting fitment for your high-quality restoration.
Key Features:
- Brand: Motorcraft
- Part Number: GRX-528
- OEM Number: 3219537 / 444919C91
- Interchange: VR115, J3219537, 3210300
- Position: Engine Bay / Alternator Control
- Engine Fitment: All Applicable I6 & V8 Configurations
- Origin: Made in USA
- Condition: New Old Replacement Stock (NORS)
Verified Vehicle Fitment:
| Make |
Model |
Year |
Engine |
Notes |
| American Motors |
Ambassador / Matador / Hornet / Gremlin / Javelin / AMX |
1971-1975 |
3.8L (232) to 6.6L (401) |
Electronic Type |
| Jeep |
CJ5 / CJ6 / CJ7 / Wagoneer / Cherokee / J-Trucks |
1972-1975 |
3.8L (232) to 5.9L (360) |
12-Volt Alternator Regulator |
| International |
Scout II |
1978-1980 |
5.6L (345) V8 |
Fits models with alternator |
Fits Years:
1971 1972 1973 1974 1975 1976 1977 1978 1979 1980
Note on Stock Photos: Due to our inventory of multiple identical units for this specific part number, we utilize representative stock photos for this listing. You will receive a component that strictly meets all listed specifications and fitment requirements. Please be aware that because these are vintage parts, minor cosmetic variations—such as surface finish, color, or production markings—may exist between different manufacturing runs. These slight aesthetic differences are a result of historical production processes and do not impact the part's integrity, performance, or authenticity.
A Note on Fitment Accuracy: We manually research and cross-reference our fitment data using vintage manufacturer catalogs. While we strive for 100% accuracy, these decades-old resources—and the humans reading them—can occasionally contain errors. Additionally, these parts may fit other vehicles and years not explicitly listed in our data. To ensure a seamless restoration, we kindly ask that you perform your own due diligence and verify that this specific part number is correct for your application prior to purchase.
Unbeatable Prices & Expectations
While many of our vintage parts were manufactured decades ago, they remain unused and high-quality. Some original boxes may show signs of shelf-wear, such as dust, tape, or surface distress from years of storage. Rest assured, the components inside have been inspected to ensure they are complete and ready to help you finish your project without breaking the bank.
