Driver Controls and Instruments Suspension Seat Adjustment Controls The blue high-beam indicator light (located above the speedometer and tachometer) which comes on when the headlights are on high beam. All adjustment controls for a suspension seat are lo- cated on the seat base. Refer to Chapter 2 for com- plete instructions. The red parking brake indicator light which comes on whenever the parking brakes are activated and the ignition is on. Vernier Throttle Control, Optional Standard Warning System The vernier throttle control can be used to adjust engine speed when the vehicle is parked.
A "quick adjust" set- ting of engine speed is made by depressing the button on the control knob, then pushing in or pulling out the knob. Engine speed adjustments can then be made in smaller increments by turning the control knob in either direction. Standard Warning Lights Standard red warning lights are for alternator no- charge, and the brake system. See Fig. 3.14 . When- ever conditions cause the brake system warning light to come on, a warning buzzer also alerts the driver. Warning and Indicator Lights The brake system warning light and buzzer activate whenever air pressure in the primary or secondary air reservoir falls below 64 to 76 psi (441 to 524 kPa).
Warning and indicator light modules, located on each side of the speedometer, house all of the standard and optional warning and indicator lights. Figure 3.14 identi- fies the warning and indicator lights. All of the standard and optional warning and indicator lights are located in light banks on each side of the speedometer. Optional Warning and Indicator Lights The water temperature warning light and buzzer acti- vate whenever the engine coolant temperature exceeds a preset point determined by the engine manufacturer. Refer to Table 3.1 for this temperature. Standard indicator lights include:
The green right- and left-turn signal lights, which flash on and off whenever the outside turn signal lights are flashing. The oil pressure warning light and buzzer activate whenever the oil pressure falls below the minimum oil pressure recommended by the engine manufacturer. Refer to Table 3.2 . 3.10