Chrysler DODGE D150 1993 Service Manual page 382

• • ^ ^ ^ INSTRUMENT PANEL AND GAUGES 8E - 1
C O N T E N T S
page
CLUSTER AND GAUGE SERVICE PROCEDURES . 12
CLUSTER AND GAUGE TEST PROCEDURES . . i
GENERAL INFORMATION . 1
page
MESSAGE CENTER-DIESEL ENGINE . . . . . . . . 4
MESSAGE CENTER-GAS ENGINE . . . . . . . . . . 3
SWITCH AND PANEL COMPONENT SERVICE . 16
GENERAL I N F O R M A T I O N
INDEX
page
Generator Indicating System 2
Distance Sensor
2
Electronic Digital Clock
3
Fuel Level Indicating System 1
page
Malfunction Indicator (Check Engine) 3
Oil Pressure Warning Lamp . . . . . . . . . . . . . . . . . 2
Speedometer/Odometer System
2
Temperature and Oil Indicating System . . . . . . . . . 2
D-body trucks have an instrument cluster which
includes gauges for fuel level, coolant temperature,
oil pressure, and charging system voltage (Fig. 1).
When the ignition switch is in t h e OFF position all
the gauges will show a reading except the voltage
gauge. However, the readings are only accurate
when the ignition switch is in the O N position.
The cluster also includes warning lamps for:
• seat belt warning
• low oil pressure
• high beam
• left and right t u r n signals
• check engine.
J908E-66
Fig. 11nstrument Cluster
FUEL LEVEL INDICATING SYSTEM (FIG. 2)
A hinged float arm in the fuel tank raises or lowers
depending on the fuel level. The float arm contacts a
variable resistor in the gauge sending unit. This pro­
vides a change of resistance in the fuel gauge circuit
with any up or down movement of the float. This sender
resistance is shown as fuel level on the gauge.
Resistance is greatest when the fuel level in the
tank is low and t h e float arm drops. With high resis­
tance current flow is low and consequently positions
the instrument panel gauge pointer to low.
Resistance in the circuit is at a minimum when the
t a n k is full and the float arm is raised. With resis­
tance at a minimum, current flow is high registering
full on the instrument panel gauge.
12 VOLTS
TO
GAUGE
I P
FUEL TANK
SENDING UNIT
FLOAT
SENDING
UNIT
1 :
1
j ^ fCONNECTOR
!g|yj-»—
FUEL
GAUGE
FUEL
TANK
J098E-47
Fig. 2 Fuel Level Indicating System
INSTRUMENT PANEL AND GAUGES