Turn Signal and Hazard Lamps

The Turn Signal Lamps and Hazard Lamps are the same lamps. When operating as turn signal lamps, only the two bulbs on the selected side of the vehicle are flashed. When operated as Hazard Lamps, all four bulbs are flashed.

When operating as Turn Signal Lamps, power is provided from TURN B/U Fuse 16 through the PNK (139) wire to the normally closed contacts of the Hazard Warning Switch. This voltage is only available when the Ignition Switch is in Run or Start. With the Hazard Warning Switch depressed to the down position, the normal position voltage is carried by the LT BLU (1509) wire to the Turn/Hazard Lamp Flasher.

The Turn/Hazard Lamp Flasher operates as a automatic-reset thermal switch. With current passing through the flasher, after a period of time the flasher heats up and operates internal contacts. This stops the current and allows the flasher to cool down. When cool, the internal contacts close again to allow current to flow. With current flow, voltage is available through the flasher through the PPL (16) wire to the Turn Signal Switch and the Hazard Warning Switch contacts. The Hazard Warning Switch contacts remain open.

With the Turn Signal Switch (part of the Multi-Function Lever) in the left turn (down) position, voltage is available and distributed by the LT BLU (14) wire. Voltage is provided to the turn signal bulb in the Left Front Park and Turn Signal Lamp(s). Current flows through the lamp(s) and the BLK (150) wire to Ground G105 Voltage is also provided to the turn signal bulb in the Left Rear Park and Turn Signal Lamp. Current flows through the lamp and the BLK (150) wire to Ground G400. The LT BLU (14) wire also makes this voltage available at the Left Turn Indicator bulb in the Instrument Cluster. Since the bulb is grounded by the BLK (150) wire to Ground G201, the Left Turn Indicator flashes as the exterior turn signal lamps flash. The LT BLU (14) wire also provides this voltage to the optional Trailer Wiring Provision Connector C406, if provided.

With the Turn Signal Switch in the right turn (up) position, voltage is available and distributed by the DK BLU (15) wire. Voltage is provided to the turn signal bulb in the Right Front Park and Turn Signal Lamp(s). Current flows through the lamp(s) and the BLK/WHT (151) wires to Ground G109. Voltage is also provided to the turn signal bulb in the Right Rear Park and Turn Signal Lamp. Current flows through the lamp and the BLK (250) wire to Ground G401. The DK BLU (15) wire also makes this voltage available at the Right Turn Indicator bulb in the Instrument cluster. Since the bulb is grounded by the BLK (1 SO) wire to Ground G201, the Right Turn Indicator flashes as the exterior turn signal lamps flash. The DK BLU (15) wire also provides this voltage to the optional Trailer Wiring Provision Connector C406, if provided.

When the Hazard Warning Switch is depressed, the normal voltage source from TURN BU Fuse 16 on the PNK (139) wire is isolated by open contacts. The Hazard Warning Switch's normally open contacts close to connect to a voltage source that is available at all times. The lamps are now operated by voltage from HAZARD Fuse 5 carried through the ORN (1040) wire to the Hazard Warning Switch. This voltage is made available to the Turn/Hazard Lamp Flasher through the LT GRN (62) wire. From the flasher, the PPL (16) wire carries this voltage to both the Turn Signal Switch and the Hazard Switch contacts. The Hazard Switch contacts are now closed and voltage is distributed on both the DK BLU (15) and the LT BLU (14) wires to the lamps and indicators. Turn Signal Switch position has no impact. Since ground paths are provided, current flows and the flasher cycles it's internal contacts open and closed as previously described.