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GMC ZE06581 1976 Maintenance Manual Supplement page 103

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The information described
in
Maintenance Manual X-7525 under the heading
CHASSIS ELECTRICAL (SEC . 12) is applicable to models covered by this supplement
with the exception of the following :
SPEEDOMETER AND GAUGE
CLUSTER
(Refer to Figure 1)
"Face" changes have 'aken place on the
speedometer head and gauge cluster.
The
speedometer now includes kilometers per hour
as well as miles per hour .
Both components
are serviced as before .
PRINTED CIRCUITS
CHECKING TELL-TALE PRINTED CIRCUIT
USING TELL-TELL LIGHT PANEL
(Refer to Figure 2)
To check "Engine Water" tell-tale circuit
proceed as follows:
Figure 1-Speedometer and Gauge Cluster
SECTION 12
CHASSIS ELECTRICAL
Contents of this section are listed below :
SUBJECT
PAGE NO .
Instruments and Gauges . . . . . . . . . . . . . . . . . . . . .
12-1
Speedometer and Gauge Cluster . . . . . . . . . . . . . . . . .
12-1
Printed Circuit . . . . . . . . . . . . . . . . . . . . . . . .
12-1
Coolant Level - Engine Water - Indicator
. . . . . . . . . . .
12-2
Wiring
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-3
Instrument Panel Wiring . . . . . . . . . . . . . . . . . . . .
12-3
Horn
. . . . . . . . . . . . . . . . . . . . . . . . . . . :
12-3
Radio and Tape Player . . . . . . . . . . . . .
. . . . . . . .
12-4
Stereo Tape Player Convector
. . . . . . . . . . . . . .
.
. . .
12-4
Light Bulb Specifications . . . . . . . . . . . . . . . . . . . . .
12-4
INSTRUMENT
A-6171
AND GAUGES
1 . Remove instrument panel rear cover .
Figure 2-Tell Tale Printed Circuit
12-1
2 . Remove tell-tale light panel connector
and remove the tell-tale panel .
3 . With a continuity light, connect one
probe of test light to "41" of the printed
circuit ("FEED") and the other probe to "937" .
If the test light lights, bulb and circuit are
good . If the test light does not, light, remove
the "937" bulb and check bulb . If bulb is good,
problem is in the printed circuit board .
NOTE: There is no "low air" warning system
on circuit "900".
LEGEND-CIRCUIT CONNECTOR
925
75B
ISOL
929
937
41
9278
927A
920
DOOR
LOW AIR
PARK BRAKE
GROUND
LOW FUEL
ENGINE WATER
FEED (ACC . BUS BAR)
SET POWER
LEVEL TO TRAVEL
CRUISE
A6170

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