windows, as on your car. Here we refer to gauges and
Q6-33.
In an item of SE with an automatic trans-
meters that relay vital information. Support equipment
mission, which of the following components,
accessories also include safety and comfort acces-
will prevent the engine from starting with the
sories, such as turn signals, horns, windshield wipers,
transmission select lever in a position to drive
and electric fans. All of this equipment is electrically
the vehicle?
operated.
1.
The neutral safety switch
The need for automotive accessories has increased
2.
The shifter safety switch
dramatically over the last decade. Accessories allow
3.
The forward/reverse safety switch
you to monitor the operation of a unit. The readings
4.
The park/drive safety switch
taken from the gauges and meters can warn you of
Q6-34.
When used with a two-stroke cycle diesel
malfunctions or impending failure. Some required
engine, which of the following components
preventive maintenance is scheduled according to the
actuates the starter lockout switch?
readings on hour meters and start meters.
1.
Engine oil pressure
As a Support Equipment Technician, you are
2.
Engine fuel pressure
responsible for maintenance and repair of the
3.
Engine water temperature
automotive accessories. On some vehicles, this may
4.
Engine blower air pressure
seem to be a difficult task; but the mystique is easily
Q6-35.
You should not attempt to make a capacity test
removed by referring to the manufacturers' manuals.
if the specific gravity reading is less than
The schematics and narratives on each system are
which of the following readings?
written in sufficient detail so you can easily understand
them.
1.
1.220 or less
2.
1.120 or less
INSTRUMENT ACCESSORIES
3.
1.100 or less
4.
1.000 or less
The instrument accessories are usually placed on a
panel so they can be easily read by the operator. They
ACCESSORIES
inform the operator of the approximate speed, engine
temperature, oil pressure, rate of charge or discharge of
LEARNING OBJECTIVES: Identify proce-
the battery, amount of fuel in the fuel tank, distance
dures for inspecting, checking, testing, and
traveled, and the time. Certain controls are frequently
adjusting SE electrical accessories. Identify
mounted on the instrument panel, such as the throttle,
procedures for troubleshooting SE electrical
choke, starter switch, heater, and windshield wipers.
accessories. Identify procedures for repairing,
removing, and replacing SE electrical acces-
sories.
The typical automotive ammeter (fig. 6-74, view
What is an automotive accessory? On support
A) contains a steel armature mounted on the same shaft
equipment it is not an AM/FM stereo radio or electric
POINTER
GE
CH
R
HA
AR
0
15
SC
15
G
DI
E
BATTERY
30
30
REGULATOR
PERMANENT
MAGNET
L
AMMETER
TERMINAL
TO LIGHTS, ETC.
PIVOT
ARMATURE
CONDUCTOR
TERMINAL
B
A
ASf06074
Figure 6-74.--(A) Simplified automotive ammeter; (B) Wiring diagram showing ammeter in the charging circuit.
6-61
