This is a A-121578C1 Voltage Regulator (6 Volt) PN: 121578C1Main Description As Following : A-121578C1 Voltage Regulator (6 Volt) P.N: 121578C1 Fits all 6 volt tractor & combine applications.Replaces: Delco 1118308, 1118780 & 1119575 Stocked As: A-TR-104 , Crosses To: A-TR-104 , Found in Section & Models : Ignition & Electrical Parts > Ignition & Related Parts, Case-IH TRACTOR: C (6 volt), Case-IH TRACTOR: CUB (6 volt), Case-IH TRACTOR: CUB LO-BOY, Case-IH TRACTOR: CUB LO-BOY (6 volt), Case-IH TRACTOR: H (6 volt), Case-IH TRACTOR: HV (6 volt), Case-IH TRACTOR: M (6 volt), Case-IH TRACTOR: MD (6 volt), Case-IH TRACTOR: MDV (6 volt), Case-IH TRACTOR: MV (6 volt), Case-IH TRACTOR: O4, Case-IH TRACTOR: SUPER A (6 volt), Case-IH TRACTOR: SUPER AV (6 volt), Case-IH TRACTOR: SUPER AV1 (6 volt), Case-IH TRACTOR: SUPER C (6 volt), Case-IH TRACTOR: W4, Case-IH TRACTOR: W6, Case-IH TRACTOR: W9, Case-IH TRACTOR: 100 (6 volt), Case-IH TRACTOR: 130 (6 volt) Associated Items : New Also A-CA-O-C, A-CA-P-CC, A-CA-P-MAG, A-CA-S-MAGNETO, A-CA-S-TOOLS, A-FRM-IHOL, A-IH-C-DOMGENCAT, A-IH-C-MUSCLES, A-IH-C-1936FULL, A-IH-O-C, A-IH-O-C1952, A-IH-P-ACCESSORY, A-IH-P-C, A-IH-P-IMPCSUPC, A-IH-S-CARBSPEC, A-IH-S-ENGGASE, A-IH-S-TOUCHCTL, A-IH-S-TUNEUP, A-MAG-S-317, A-SMC201 And : Fits all 6 volt tractor & combine applications. Replaces: Delco 1118308, 1118780 & 1119575