Powermaster 517943 High-Output GM Denso Alternator 245 Amp Black 3-Inch 6-Groove Serpentine

The Powermaster 517943 is a high-output 245-amp alternator built in a GM Denso case style with a durable black powdercoat finish. Designed as a direct bolt-on upgrade for GM Corvette applications, this alternator delivers serious charging capacity to support modern electrical demands including high-powered audio systems, aftermarket lighting, cooling fans, and other performance accessories.

Powermaster engineers this alternator with hand-wound, custom-designed stators and heavy-duty internal components to deliver strong output even at low engine speeds — ideal for performance builds where idle charging is critical. The unit features an internal voltage regulator and is equipped with a 3-inch diameter, 6-groove serpentine pulley for precise belt engagement and underdrive compatibility.

Key Features:

• 245-amp high-output rating — significantly surpasses stock alternator capacity
• GM Denso case style — direct bolt-on fit using factory mounting brackets and wiring
• Black powdercoat finish — corrosion-resistant and stealthy under-hood appearance
• 3-inch diameter, 6-groove serpentine pulley — included and ready to install
• Internal voltage regulator — self-contained, no external regulator required
• Hand-wound custom stators — optimized for high output with excellent idle performance
• Heavy-duty regulators and rectifiers — built for sustained high-demand use
• Gold-plated battery post — reduces resistance for better electrical connections
• Proof of performance tag — each unit individually tested before leaving the factory
• Made in the USA

Powermaster's high-amp alternators are the go-to choice for performance enthusiasts who demand reliable, high-capacity charging without sacrificing fitment or under-hood aesthetics. The 517943 is sold individually.