Speedmaster D411 Alternator Voltage Regulator for GM Chevrolet CS130 CS121 CS144

The Speedmaster D411 is an alternator voltage regulator designed for GM Chevrolet alternators, including the CS130, CS121, and CS144 models. This regulator controls the charging voltage output from your vehicle's alternator to ensure optimal battery charging and electrical system performance. It is engineered as a direct-fit replacement for these specific alternator models and is essential for maintaining proper electrical system operation in classic and modern Chevrolet vehicles.

This voltage regulator is built to handle the demanding requirements of automotive electrical systems, providing stable voltage regulation to prevent battery overcharging and electrical component damage. The D411 regulator is compatible with the popular CS-series alternators commonly found in Chevrolet engines, making it an ideal choice for restorations, repairs, and performance upgrades where reliable charging control is critical. Whether you're rebuilding an alternator assembly or replacing a failed regulator, the Speedmaster D411 delivers the precision engineering needed for dependable vehicle operation.

Key Features & Benefits

• GM Chevrolet Compatible: Fits CS130, CS121, and CS144 alternators commonly used in Chevrolet vehicles.
• Voltage Regulation: Controls alternator output to prevent battery overcharging and electrical system damage.
• Direct Replacement: Engineered as a drop-in replacement for original D411 regulators.
• Speedmaster Brand: Manufactured by Speedmaster, a trusted supplier of automotive electrical components.

Specifications

Ideal Applications

• Chevrolet classic car and truck electrical system repairs
• Alternator rebuilding and restoration projects
• Engine bay electrical upgrades requiring voltage regulation
• Original equipment replacement for charging system maintenance