Voltage is available through the PARK LP fuse to the headlamp and panel dimmer switch at all times. when the headlamp and panel dimmer switch is in the PARK position or in the HEAD position, voltage is available to the following components:

Voltage is available at all times through the STOP/HAZ fuse to the torque converter clutch (TCC)/stoplamp switch. With the depression of the brake pedal, the contacts in the TCC/stoplamp switch close. Voltage is available from the stoplamp relay on pickups, or the TCC/stoplamp switch on all of the other vehicles, through the turn/hazard switch to the left stoplamp, the right stoplamp, and the stoplamp lights. If a turn signal is in operation, the stoplamp on that side flashes as a turn signal. The other stoplamp serves as a stoplamp.

With the ignition switch in the RUN position or the START position, voltage is available through the TURN-B/U fuse and through the turn/hazard flasher to the normally-closed contact of the hazard flasher switch in the turn/hazard switch.

With the turn signal switch in the left turn position, voltage is available to both the left turn indicator and to CKT 14 (LT BLU) of the left park/turn lamp. Voltage is available to CKT 18 (YEL) of the left rear turn lamp.

The lamps illuminate immediately. The lamps begin flashing when the current flow heats the timing element in the flasher. The timing element repeatedly opens and closes the circuit.

The voltage to the left front park/turn lamp is also available to the left front marker lamp. If the headlamp and panel dimmer switch is in the OFF position, the left front marker lamp finds a path to ground through splice S122 and through the many lamps connected in parallel to ground. These lamps provide low resistance paths to ground. The marker lamp flashes with the turn lamps. The lamps used for the ground path do not flash, however, because the voltage drop across the marker lamp is much higher than across the other lamps.

When the headlamp and panel dimmer switch is in either PARK or HEAD, voltage is available through the PARK LP fuse, the headlamp and panel dimmer switch, and splice S122 to the marker lamps and the park lamps. If the turn/hazard switch is in the TURN LEFT position, the left front marker lamp has voltage at both connections and the lamp extinguishes. When the flasher removes voltage to the turnlamp, the marker lamp grounds through the turnlamp and the marker lamp illuminates. In this manner, the left front marker lamp flashes when the left front park/turn lamp extinguishes.

With the turn/hazard switch in the TURN RIGHT position, voltage is available to the right lamps in the same manner.

Voltage is available at all times through the STOP/HAZ fuse and the turn/hazard flasher to the normally open contact of the hazard flasher switch in the turn/hazard switch. With the hazard switch in the HAZARD FLASH position, voltage is available to both the front turn lamps and the rear turn lamps. All of the turn lamps and the turn indicators flash on and off.

The front marker lamps flash in the HAZARD FLASH position in the same manner these lamps flash in the TURN RIGHT position and the TURN LEFT position. If the headlamp and panel dimmer switch is in the OFF position, the front marker lamps flash when the hazard lamps are in operation. If the headlamp and panel dimmer switch is in either the PARK position or the HEAD position, the front marker lamps flash ON when the hazard lamps are not in operation; and the front marker lamps flash OFF when the hazard lamps are in operation.

In the HAZARD position, the circuit is always open, and the turn/hazard flasher controls the lamps.

Voltage is available at all times through the CTSY fuse 3 to the cargo lamp switch. When the cargo lamp switch is in the ON position, voltage flows through the switch to the lamp. Ground is available at the following components:

If the vehicle has either option 7X6 or 7X7 as part of the police package Z56, one or 2 spot lamps are on the A pillar. Voltage is available at all times from fuse BLANC through CKT 940 (BLK) to the spot lamps. The spot lamps are permanently case-grounded. When the spot lamp thumb switch located on the inside end of the spotlamp assembly moves, the circuit completes.

If the vehicle is equipped with option 6F5 as part of the police package Z56, an extra wiring harness is available for any roof-mounted aftermarket accessories. The harness begins under the right side of the instrument panel in a coil on the floor. The harness route then proceeds under the right front door sill plate, up the right B pillar, and across the roof bow. The harness loops 81.3 cm (32 in) to the rear of the windshield centerline.

As part of the police package Z56, an extra wiring harness and a relay are available for any aftermarket accessories, which would include grille lights and a grille speaker. The harness starts under the right side of the instrument panel in a coil on the floor. The harness route then proceeds through a grommet in the bulkhead and down the right side of the engine compartment. The harness then loops behind the right side of the grille.