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ELECTRICAL-BODY A N D CHASSIS 12-26
•
Low oil pressure
•
High engine temperature
•
Defective wiring or switch
connector from sender
in block above starter on
and at left front of distributor on V-8
Sending Unit Replacement
1. Disconnect wiring harness
unit terminal (located
L-6 engines
engines).
2. Remove sender unit using Tool J-21757 or 12 point
socket, replace with new unit and check operation.
GENERATOR INDICATOR
1. Ignition on, Engine not Running and Telltale Light
Off.
•
Indicator bulb burned out, replace bulb.
•
Open circuit or loose connection in the telltale
light circuit.
2. telltale Light Stays on after Engine is Started.
If indicator light does not go out at engine idle
speed, refer to Charging Systems under Engine
Electrical, Section 6Y.
TEMPERATURE (COOLING SYSTEM) INDICATOR
The temperature indicator circuit consists of two re-
motely located units, indicator gauge and engine sender
unit. The indicator gauge, located in the instrument
panel, consists of a red light which will indicate an over-
heated engine condition.
Engine Sender Unit Replacement
1. Drain engine cooling system to a level below unit.
2. Remove sender unit (located in the inlet manifold
near water pump housing on V-8 engines and in the
cylinder head near an exhaust port oh L-6 engines)
and replace with new unit.
3. Refill cooling system and check operation of unit.
CHEVELLE INSTRUMENTS AND GAUGES
INDEX
Page
General Description
*
*
i2-26
Service Operations
12-26
Instrument Panel
12-26
Instrument Cluster.
12-26
Fuel Gauge and/or Ammeter
12-27
Clock, i
12-27
Speedometer
12-27
Page
Speedometer Cable
. .
12-27
Temperature Gauge
12-29
Oil Pressure Gauge
12-29
Indicator Lights. .
12-29
Oil Pressure Indicator
12-29
Generator Indicator
. . 12-29
• Temperature Indicator
12-29
GENERAL DESCRIPTION
The Chevelle instrument cluster assembly consists of:
a speedometer; a fuel gauge; a generator, an engine tem-
perature and an oil pressure indicator lamp, and includes
a clock on deluxe models. On super sport models, am-
meter, coolant temperature and oil pressure gauges re-
place the appropriate indicator lights. Except for the
speedometer, all of the indicator lamps, instruments and
gauges of these clusters may be serviced without remov-
ing the instrument cluster assembly from the vehicle.
In addition to the instrument indicator lamps, a brake
warning lamp is included in the cluster as standard
equipment. The indicator is connected to the parking
brake and brake pressure differential switches and
serves a dual function. It lights when the parking brake
is applied and also when the brake pedal is applied, if a
malfunction should occur in the brake system due to a
loss of hydraulic pressure. Servicing of the hydraulic
pressure differential switch is covered in Section 5 of
this manual.
Regular maintenance is not required on the instrument
cjLuster or its components other than maintaining d e a n
and tight electrical connections, replacing defective parts
and keeping the speedometer cable properly lubricated.
SERVICE OPERATIONS
INSTRUMENT PANEL ASSEMBLY
INSTRUMENT CLUSTER (Figs. 41 thru 44)
Removal
1. Disconnect battery ground cable.
2. Remove steering coupling bolt and disconnect steer-
ing shaft from coupling.
3. Loosen mast jacket lower clamp.
4. Remove air conditioning center distributor duct (if
so equipped).
5. Remove radio rear support bracket screw.
6. Remove mast jacket upper support clamp and retain-
ing bolts from lower support (refer to Section 9,
Steering).
CAUTION:
Cover mast jacket and parl
brake handle with a suitable material to prevc
scratching.
7. Disconnect speedometer cable at rear of cluster
housing and speed warning control knob at panel (if
so equipped).
8. Remove instrument panel retaining screws (nine
upper and five lower). .
9. Working under the console remove four lower retain-
ing screws from instrument cluster housing.
10. Pull instrument panel assembly from console and lay
forward on mast jacket.
11. Disconnect wiring harness, cluster lamps and wiring
CHEVROLET CHASSIS SERVICE MANUAL
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