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INSTRUMENTS
8-7 1
Testing the Temperature Indicating System
in the Vehicle
Disconnect the terminal from the temperature
sending unit on the engine. Connect one test lead of
tester C-3826 to the terminal and the other test lead
to a good ground. Place the pointer of the gauge test-
er on the
"L"
position and turn the ignition switch
to "on." The temperature gauge should show "C"
plus or minus Ys inch.
NOTE:
Thermal gauges are slow in operation.
Al-
low time for gauge to heat up.
Place the pointer on the tester on the
"M"
position
and the temperature gauge should advance to the
driving range or
v8
position of the dial. Place the
pointer of the tester in the
"H"
position and the
gauge should advance to the "H" position of the dial.
Should the gauge respond to the above tests but not
operate when the terminal is attached to the sending
unit, indications are of a defective sending unit and it
should be replaced.
Should the gauge fail to respond to the above tests,
indications are of possible loose connections, broken
wire, open printed circuit, or faulty gauge. The instru-
ment cluster should be removed for further inspec-
tion. See "Instrument Cluster."
Testing Temperat ure Gauge-Instrumen
t
Cluster Removed Wigs.
7,8,
and 9 1
The temperature gauge is tested in the same man-
ner as the fuel gauge with the exception that Tester
C-3826 is connected to the temperature gauge "S"
terminal.
With the gauge tester on
"L"
position, the tem-
perature gauge should show "C" or cold. With the
gauge tester on
" M
position, the temperature gauge
should show
? h
of the operating scale of the dial.
'
T O
BATTERY
T O
BATTERY
( + I P O S T
POSITIVE
)
( - 7 I V E P O S T
/
'
TEMPERATURE
\I\ /
GAUGE
T O IGNiTlON INPUT
\
TERMINAL
1
GFOUND
TEMPERATURE GAUGE
/
"S'
TERMINAL
TO
BATTERY
POSITIVE
(+I
POST
Fig. 8-Testing
Temperature Gauge-
Models AR-I and AR-2
With the gauge tester on the
"H" position, the tem-
perature gauge tester should show "H." If the gauge
does not respond to the above tests, test for an open
printed circuit or replace the temperature gauge.
OIL PRESSURE WARNING LAMP
To test the oil pressure warning lamp, remove the
terminal from the oil pressure sending unit. Connect
one lead of the gauge tester to the terminal and the
other test lead to a good ground.
With the ignition switch in the "on" position and
the gauge tester in the
"L"
position, the warning
lamp should not light. With the gauge tester in the
"M" position, the warning lamp should show a dull
glow. With the gauge tester in the
"H" position, the
lamp should show full brilliance.
Should the oil pressure warning lamp fail to re-
spond to the above tests, indications are of possible
loose connections, broken wire, or a burned out lamp.
\\
,TO
BATTERY
FUEL
b ? L
/
TERMINAL
GROUND
(BAT"
L
Fig. 7-Testing
Temperature Gauge-
Models A V - I and AV-2
Fig. 9-Testing
Temperature Gauge-
Models AP-1 and AP-2
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