Operation - Section 3 OM3017.3 Page 3-20 Instrument Panel and Indicator Lights (3, Figure 3-7) WINDSHIELD WIPER & WASHER SWITCH (6, Figure 3-7) LADDER LIGHT SWITCH The windshield wiper control switch is a four position rotary switch with intermittent wiper delay and wash feature. "Off" position is the de- tented position when the knob is rotated fully counterclockwise against the stop. The intermittent wiper position is located between off and the first detent position when rotating the knob clockwise. Rotating the knob closer to the first detent position decreases the time interval between wiper strokes. Rotate the knob clockwise to the first detent position for slow speed.
Rotate the knob to the second detent position for fast speed. Push the knob in to activate the wind- shield washer system. The switch turns ladder light "On" or "Off" after or before using ladder. A similar switch is mounted at front left of truck near the base of ladder. (7, Figure 3-7) MANUAL BACKUP LIGHT SWITCH The Manual Backup Light Switch allows backup lights to be turned "On" providing added visibility and safety when the Selector Switch (see OPERATOR CONTROLS AND EQUIPMENT) is not in "REV" posi- tion. When the lever is moved up- ward to the "on" position, the MANUAL BACK UP LIGHT indicator (27) will be illuminated.
(4, Figure 3-7) LIGHT SWITCH The instrument panel lights, clear- ance lights, and the headlights are controlled by this three position ro- tary type switch. "OFF" is the full counterclockwise position of the switch. The second position clockwise from "Off" completes the circuit from the battery to the instrument panel lights, clearance lights, and taillights. The third position clockwise adds the headlights to the panel lights, clearance lights, and taillights circuit. (8, Figure 3-7) FOG LIGHTS (OPTIONAL) Fog Lights are optional equipment that are useful in foggy conditions and heavy rain. Moving the lever upward turns lights "On". Down- ward is "Off".
(9, Figure 3-7) HIGH MOUNTED HEADLIGHTS (OPTIONAL) (5, Figure 3-7) ENGINE STARTING AID (OPTIONAL) When optional headlights are mounted at top of grille structure, this switch controls these lights. Moving the lever upward turns lights "On". Downward is "Off". The OPTIONAL Engine Starting Aid switch is spring-loaded to the "Off" position. Use only when ambient temperature is below 50 o F (10 o C). When switch is held in the "On" po- sition, ether is injected into the en- gine intake manifold to aid engine starting in cold weather. Move the Engine Starting Aid switch to the "On" position while cranking engine, for three (3) seconds maximum , and then release Engine Starting Aid.
If engine does not start, wait at least fifteen (15) seconds before repeating the procedure. Refer to "Operating Instructions" in next section, for more specific operating details. (10, Figure 3-7) PANEL LIGHT DIMMER The panel light dimmer control is a rheostat which allows the operator to vary the brightness of the instru- ments and panel lights. Rotating knob to the full counterclockwise position turns panel lights "On" to brightest condition. Rotating knob clockwise continually dims lights until "Off" position is reached at full clockwise rotation.