Starter solenoid for 3 terminal systems. Fitted on Minis from 1959-82 and many Reliant models. This solenoid has only 3 terminals and is missing the terminal to supply voltage to the coils on ballast resistor sytems found on later cars. If this part is in short supply a 4 terminal solenoid (WC-ADU5728) can be used in it's place.