Overview

ProForm 63-amp GM 10SI-style three-wire alternator with internal regulator, natural finish and machined pulley. Intended for specified 1973–1986 GM applications; confirm fitment and wiring. Part number: 66436-FMQX.

Can you tell the difference? Most alternators look nearly the same, and that is why what is on the inside is so critical. Reliability starts with how it is made. Choosing PROFORM means choosing alternators with components produced by highly specialized machines, assembled by highly trained personnel using dedicated jigs and equipment, with everything 100 percent new for maximum longevity and optimum performance. After assembly each alternator is individually tested at the factory. Finally, it is boxed with a quality assurance graph that documents the specific units output performance. We do the testing, not you! And PROFORM proves it! Sold individually.

Product Details:

• Completely Brand New Alternator
• 63 Amp Model
• GM 10si 3-Wire Type With Internal Regulator
• For 1973-1986 Buick, Chevrolet, GMC, Oldsmobile, Pontiac
• Natural Finish With No Logo
• Includes New Machined Pulley
• Sold Individually

Additional features and specifications

• GM 10si Style; 12-Volt
• Fits Small-Block & Big-Block Chevy V8
• 63 AMP External Fan & 2.5-in. V-Belt Pulley

Product documentation

• PROFORM 3-Wire Alternator Instructions 66445series (PDF)
• PROFORM manufacturer product information – 66436