General purpose push-pull headlights switch with internal circuit breaker. shafy and knob are removable for ease of installation. Knob is permanently attached to the shaft. Headlamp/Parking Lights/Tail Lights function the same as in the 3-position switches, but with the addition of a rotary dimmer function for pane./dome lights. In = All lights Off, except dome light on rotary dimmer. Mid = Parking lights & rear lights On; panel lights & dome light on rotary dimmer. Out = Headlights & rear lights On; panel lights & dome light on rotary dimmer.4.5 ohm. Dimmer, 15A at 12V internal Circuit Breaker. With black knob imprinted with SAE headlamp symbol. Eight blade terminals accept Delphi (Packard) connector 2977645 or 2984169 (not supplied). Plated steel case. Mounting stem 7/16"-28 thread. Terminal connections: 1 to battery +; 2 to panel lights; 3 to rear lights; 4 to rear lights; 5 to battery +; 6 to headlights; 7 to parking lights; A to dome light. Connect frame ground terminal to ground.