Diode for speed control on 1967 to 1983 Harley Davidson and for 1990 to 1999 Columbia Par Car. +++ 1990 and newer E-Z-GO +++ Also Cushman, Melex, Hyundai and others using Curtis electronic motor speed controller +++ Used across solenoids on Marketeer and Nordskog +++ Used across solenoids on Pargo model 544 with eight solenoids.