Circuit Operation - Exterior Lights

TURN LIGHTS
With the Ignition Switch in RUN, BULB TEST or START voltage is applied through the TURN B/U Fuse and the Turn Flasher to the normally closed contact of the Hazard Switch in the Turn/Hazard-Headlight Switch Assembly.

With the Turn Switch in the LEFT position, voltage is applied to both the LH Turn Indicator and the LH Front Park/Turn Light (LT BLU wires). Voltage is also applied to the LH rear Turn Light (YEL wire). The lights go on immediately. They begin to flash when the current flow heats up the timing element in the Turn Flasher and it repeatedly opens and closes the circuit (turn signals flash 60-120 times per minute). If one of the turn signal bulbs is inoperative, the turn signal flasher will indicate the problem by not flashing the remaining bulbs.

The voltage applied to the LH Front Park/Turn Light will also be applied to the LH Front Marker Light. If the Headlight Switch is OFF the LH Front Marker Light will find a path to ground through splice S105 and the Front Park/Turn Lights. These lights provide low resistance paths to ground. The Marker Light will flash with the Turn Lights. The lights used for the ground path will not flash, however, since the voltage drop across the Marker Light is much higher than that across the other lights.

When the Headlight Switch is in either PARK or HEAD, voltage is applied through the PK/TURN Fuse, the Headlight Switch, and splice S105 to the Marker and Park Lights. If the Turn Switch is in LEFT the LH Front Marker Light will have voltage at both connections and will not light. When the Turn Flasher stops voltage to the Turn Light, the Marker Light will be grounded through the Turn Light and will go on. In this way, the LH Front Marker Light will flash on when the LH Front Park/Turn Light goes off, and off when the Turn Light goes on.

With the Turn Switch in RIGHT, voltage is applied to the RH lights in a similar way.

HAZARD LIGHTS
Voltage is applied at all times through the S/LP Fuse and the Hazard Flasher to the normally open contact of the Hazard Switch in the Turn/Hazard-Headlight Switch Assembly. With the Hazard Switch ON, voltage is applied to both Front and Rear Turn Lights. All of the Turn Lights and both Turn Indicators flash on and off 60 to 120 times per minute.

The Front Marker Lights flash with the Hazard Lights on just as they did in Turn Light operation. If the Headlight Switch is in OFF, they flash on when the Hazard Lights are on. If the Headlight Switch is in either PARK or HEAD, they flash on when the Hazard Lights are off, and off when the Hazard Lights are on.

With the Hazard Lights on, the turn circuit is always open, and the Hazard Flasher controls the lights.

PARK/MARKER LIGHTS
Voltage is applied through the PK/TURN Fuse to the Headlight Switch at all times. With the Headlight Switch in PARK or HEAD, voltage is applied to the Park and Marker Lights.


STOP LIGHTS
Voltage is applied through the S/LP Fuse to the Brake Switch at all times. When the brake pedal is depressed, the Brake Switch closes and applies voltage to the Center High Mounted Stop Light Assembly and also to the Stop Lights through the Turn/Hazard-Headlight Switch Assembly.

TAIL/REAR MARKER/LICENSE LIGHTS
Voltage is applied through the PK/TURN Fuse to the Headlight Switch at all times. When the Headlight Switch is in PARK or HEAD, voltage is applied to all of the lights in this circuit.