GM 12SI 100-Amp Alternator (V-Belt) by Powermaster®
Original-style 12SI housing retains a traditional appearance while supporting upgraded charging.
This Powermaster® 12SI alternator combines an original-style housing with 100-amp rated output, providing a charging upgrade where a lower-output unit cannot meet the vehicle's electrical load. Its 75-amp idle output helps supply electrical accessories at lower engine speeds. The included internal regulator supports one-wire installation or a compatible three-wire circuit without an external regulator. The fan and single-groove V-belt pulley are included. Individual output testing provides a documented check of charging performance.
• GM 12SI-style charging applications; see full fitment list below
• 100-amp rated output; internal voltage regulation
• Output: 75 amps at idle, 90 at cruise and 100 at top end
• 6.61-inch straight mounting span; 12-volt system
• Single-groove V-belt pulley and fan included
• One-wire or compatible three-wire hookup; no external regulator required
• Finish choices: natural, chrome, polished
• Individually output-tested with documented performance
Notes
- This item is not eligible for any further discounts or promotional pricing.
WARNING: This product can expose you to chemicals including lead, sulfur, nickel, chromium, vanadium, titanium, polyvinyl chloride, and 4,4’-methylenebis (2-chloroaniline), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
