turns on the left-turn signal lights; pushing it clockwise
turns on the right-turn signal lights. When one of the
signal lights is on, an indicator light flashes on the
warning and indicator light panel. When the turn is com-
pleted, the signal will cancel and the lever will return to
the neutral position.
Electric Horn
To sound the electric horn, push the button on the turn
signal lever. See Fig. 3.11.
Air Horn, Optional
To sound the air-operated horn, pull the cable located
above the driver’s door.
Hazard Warning Light Switch
The hazard warning light switch (Fig. 3.12) is located in
the left switch bank on the instrument panel. Hazard
warning lights are operated by pushing the top of the
switch. When the hazard warning light switch is on, all
of the turn signal lights and both of the indicator lights
on the control panel will flash. To cancel the warning
lights, push the bottom of the switch.
Allison Automatic Transmission
Controls
Allison automatic transmission MD series models are
controlled by an electronic control unit (ECU). The ECU
processes information from sensors, pressure switches,
and the shift selector (Fig. 3.13) to automatically control
the transmission according to programmed
specifications.
Vehicles with these transmissions have a red do-not-
shift light in the lens and bezel assembly. Also, there is
a service light in the indicator panel on the shift selec-
tor. With the ignition switch on, both lights come on for
a few seconds; then, if there is no problem with the
1
2
f541755
1. Turn Signal Lever 2. Horn
Fig. 3.11, Turn Signal Lever
Driver Controls and Instruments
3.8
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