Instruments and Controls Identification In electric wiper systems, the delay feature is inte- grated with the wiper switch between the stop and low-speed positions. Turn the knob between the stop and low speed until the desired interval is reached. The longest delay is approximately 10 seconds be- tween strokes. Jacobs Engine Brake Switches, Optional Jake Brake controls consist of two dash-mounted toggle switches ( Fig. 2.12 ) which control the degree of engine braking. In conjunction with these switches, an engine-mounted microswitch (controlled by the throttle pedal) and an under-deck-mounted mi- croswitch (controlled by the clutch pedal) actuate the engine brake.
CAUTION Do not move the wiper arms manually. Wiper motor damage will occur if the arms are moved. Windshield Washer Control To operate the windshield washers, turn the wind- shield wipers to the desired speed. Push the "Wash- Wipe" knob in to actuate the washers. Hold the knob in for a constant stream of washer fluid. Push the knob in and release it for intermittent streams of fluid. 2 3 Left and Right Windshield-Fan Switches, Optional Ceiling-Mounted Fans 1 5 4 Ceiling-mounted defogger fans are operated by "Low/Off/High" toggle switches located in the base of the fan. f600507b 10/26/98 Heater/Air-Conditioner Controls (Standard) and Auxiliary Heater Switch (Optional) 1. Engine Brake Switch 2.
Interaxle Differential Lockout Control Valve Switch 3. Fifth Wheel Air Slider Control Valve Switch 4. Parking Brake Control Valve Knob 5. Trailer Air Supply Valve Knob Heater/air-conditioner controls ( Fig. 2.11 ) consist of two lever slide controls, a four-speed fan control switch, and a switch for the optional auxiliary heater fan. See Chapter 4 for detailed operating instructions of the heater/air-conditioner and the auxiliary heater. Fig. 2.12, Brake Switches and Control Valves See Chapter 7 , under the heading "Engine Braking System, Optional," for additional information.
Interaxle Differential Lockout Control Valve Switch Differential lockout, standard on all dual-drive ve- hicles, is driver-actuated by means of a "Lock/ Unlock" control valve switch ( Fig. 2.12 ) mounted on the control panel. A red indicator light comes on whenever the interaxle differential is locked out (switch is in the lock position; no differential action between the drive axles). A guard around the switch prevents it from being accidentally activated. 01/18/95 f600497 Fig. 2.11, Heater/Air-Conditioner Controls 2.9