Upgrade or replace the voltage regulator in Delco CS121, CS130, and CS144 alternators with this heavy-duty STS Parts / Transpo regulator. Built to the supplied specification, this 12V B-Circuit regulator is self-exciting (1-wire) and set to 14.7V for use on the listed Delco alternator series. It matches the Delco/OEM reference numbers and unit numbers you provided and is intended for direct replacement or conversion where a self-exciting 1-wire regulator is required. Part Type: Regulator Part Number(s): 80406275 / D411HD / D411XHD System Voltage: 12 V Circuit: B-Circuit Voltage Set: 14.7 Vset Type: Self-Exciting, 1-Wire System SPECS FOR: Delco CS121, CS130, CS144 Series IR/EF Alternators Replaces / Cross References Delco: 1116411, 1116429, 1116436, 1116437, 13120469, Delco ASVR 19009752, Delco Electronics 16120469, DE111, DE136, DE137, D677, D685, D698. Full cross reference and unit lists included with product.