A-Premium Alternator Rectifier Diode for Delco 12SI Series 56-78A IR/EF RD-12H
For: Delco 12SI Series 56-78A IR/EF Alternators. Used On: Delco 12SI 66-78A Alternators. Blower Resistor. Diodes Ampere: 6-50 A. Compatible with Delco Alternators, but not affiliated with General Motors or Delco.