PROFORM 66445N 70-Amp Chrome 10SI Alternator for 1973-1986 GM Vehicles

Upgrade your vehicle’s charging system with the PROFORM 66445N 10SI alternator. Designed for select 1973-1986 GM applications, this 70-amp alternator delivers dependable 12-volt electrical output for street-driven vehicles, restorations, and performance builds. Its chrome finish and aluminum case provide a clean, classic appearance while supporting long-term durability under normal operating conditions.
The PROFORM 66445N features a three-wire configuration with an internal regulator for straightforward integration into compatible GM electrical systems. A single V-belt pulley is included, helping provide proper belt engagement when matched with the correct vehicle setup. The 10SI design is widely recognized for its serviceability and compatibility with many traditional GM applications, making it a practical replacement or upgrade for an aging alternator.
This alternator is supplied as an individual unit and is intended for applications requiring a 12-volt, 70-amp charging system. Confirm vehicle compatibility, mounting arrangement, wiring connections, and belt configuration before installation. Professional installation is recommended when adapting the alternator to a modified or custom electrical system.
The PROFORM 66445N combines reliable charging performance with a polished chrome appearance that complements engine compartments ranging from factory-style restorations to custom builds. Its internal regulation and three-wire design help support consistent system operation when properly installed and connected.

Features:

• Brand: PROFORM

• Part Number: 66445N

• Output: 70 amps

• Voltage: 12 volts

• Alternator Type: 10SI

• Wiring Configuration: Three-wire

• Regulator: Internal

• Pulley Type: Single V-belt

• Case Material: Aluminum

• Finish: Chrome

• Vehicle Application: Select 1973-1986 GM vehicles

• Quantity: Each