Description
Holley Premium 150 Amp High-Output Alternator – Black Finish
Engineered for high-RPM motorsport performance and maximum electrical efficiency in GM LS and LT engine builds.
The Holley 197-303 Premium 150 Amp Alternator is designed specifically for high-performance motorsport and street applications where engines regularly push high redlines. Standard alternators often experience bearing failure or internal component destruction under sustained high RPMs, but Holley premium alternators are engineered and tested to tolerate 30% higher RPMs than conventional OEM units.
Featuring a lightweight, sculpted all-aluminium housing with an anodized/powder-coated black finish and a matching aluminium rear cover, the 197-303 delivers high output charging in a compact, stylish package. Designed for seamless integration with all Holley accessory drive bracket kits, 4th-Gen F-body vehicles, and 1998–2004 GM trucks, this unit ensures steady voltage and clean power for demanding electrical systems on track, strip, or street.
Key Features & Benefits
- ☑ 30% Higher RPM Rating: Specially built internals resist rotational strain under extreme engine speeds.
- ☑ 150 Amp Power Output: Delivers clean, highly efficient 12V output for fuel pumps, ECUs, fans, and ignition setups.
- ☑ Sculpted Aluminium Housing: Smooth silhouette in black finish optimizes engine bay clearance and styling.
- ☑ Versatile 1-Wire or OEM Wiring: Compatible with simple 1-wire connection or factory multi-wire plug setups.
- ☑ Pre-Installed Serpentine Pulley: Includes a 6-rib serpentine pulley ready for immediate drive belt installation.
- ☑ Direct Bracket Compatibility: Mounts directly to all Holley accessory brackets, 1998–2002 F-Body, and 1998–2004 GM trucks.
Technical Specifications
| Brand | Holley |
|---|---|
| Manufacturer Part Number | 197-303 |
| Amperage Output | 150 Amps |
| Voltage | 12 Volts |
| Case Material | Sculpted Cast Aluminium |
| Finish | Black |
| Engine Fitment | GM Gen III / IV (LS Based) & LT Series |
| Pulley Included | Yes (6-Rib Serpentine) |
| Wiring Style | 1-Wire or OEM Plug (P/N 197-400 plug recommended for OEM connection) |
| Fan & Regulator | Internal Fan / Internal Regulator |
What’s Included in the Box
- 1x Holley 150 Amp Premium Alternator (Black Finish)
- 1x Pre-installed 6-Rib Serpentine Pulley
- Hardware & Installation Sheet
As an official distributor of Holley performance products, JP Racing delivers full technical guidance, local UK support, and fast dispatch across the UK. Guarantee uncompromised electrical performance for your competition engine with Holley engineering.
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