This Delco 10SI-style alternator is a direct replacement across a wide range of classic Buick, Cadillac and Chevrolet/GMC vehicles that used the same 10SI footprint from the factory. It is built to OEM specifications for direct fit and function as a replacement unit, restoring full charging output once a worn or failed alternator is removed.
Wiring is simplified with a 1-wire hookup, which needs only a single connection to the battery circuit rather than a multi-pin harness, and the plug sits in the 3 o'clock position for this version. It ships with a standard width 1-V pulley, and various 17mm ID pulleys can be fitted in its place if your application needs a different pulley profile. It is internally regulated (IR) with an external fan (EF) for cooling under load.
Key Features
- Delco 10SI-style alternator, confirmed fit across Buick, Cadillac & Chevrolet/GMC
- 12 volt, 63 amp output
- Simple 1-wire hookup
- Standard width 1-V pulley fitted (various 17mm ID pulleys can be installed)
- Externally cooled, internally regulated (EF/IR)
Technical Specs
| Specification |
Detail |
| Voltage |
12V |
| Amperage |
63A |
| Rotation |
Clockwise (CW) |
| Wire Hookup |
1-Wire |
| Plug Position |
3:00 |
| Pulley Type |
1-V (Standard Width) |
| Fan Type |
External (EF) |
| Regulator Type |
Internal (IR) |
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
Vehicle Fitment Guide
| Make & Model |
Years |
| Buick Apollo, Century, Electra, Estate Wagon, LeSabre, Regal, Riviera, Skyhawk & Skylark |
1973-1985 |
| Cadillac Calais, Commercial Chassis, DeVille, Eldorado, Fleetwood & Seville |
1971-1980 |
| Chevrolet Bel Air, Camaro, Caprice, Celebrity, Chevelle, Citation, Corvette, El Camino, G-Series Van, Impala, Laguna & Malibu |
1969-1986 |
| Chevrolet C10-C30, K10-K30, K5 Blazer & Suburban Trucks |
1973-1985 |
| Chevrolet C50, C60 & C70 Medium/Heavy-Duty Truck |
1989 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| ADR0152 |
Arrowhead |
| 400-12449 |
J&N Electrical Products |
| 7127-3SE |
Lester |
Frequently Asked Questions
Will this fit without modification?
This is a 10SI-style unit built to OEM dimensions, so it fits directly on the Buick, Cadillac and Chevrolet/GMC applications listed above without modification.
What's included?
You receive one fully assembled 12V 63A alternator with pulley fitted, ready to install.
How do I know my old alternator has failed?
Common signs include a charge warning light staying on, dimming lights, or a battery that will not hold charge.
Can I change the pulley?
Yes, the unit comes with a standard width 1-V pulley and various 17mm ID pulleys can be installed in its place if your application needs a different type.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
