Temperature Gauge
The temperature gauge can be tested using a new
gauge as a substitute or by the use of a DC voltage
source and a variable resistance box.
Temperature Gauge Test
CAUTION
VARIABLE
RESISTANCE
Make sure the voltage source is turned OFF be-
fore connecting it to the electrical circuit toavoid
electrical shock and prevent damaging the
gauge.
14 VDC + 0.01 VDC
+
--
1.
Connect temperature gauge to the variable resis-
tance and DC voltage source (Fig. 33).
Figure 33
NOTE: When reading the gauge test point, there are
two white dots on the gauge face below the edge of the
glass cover for the each test point. For each variable re-
sistance setting, the needle must be pointed between
the two white dots.
1
2
4
2.
Take test point readings (Fig. 33).
IMPORTANT: Allow circuit to warm up for at least 5
minutes before taking test readings.
A. Set variable resistance to 71 ohms. Apply a 14 +
0.01
VDC to the circuit. The needle should point to
the middle of the green area (80oC).
3
B. Set variable resistance to 38 ohms. The needle
should point between the green and red area
(105
oC).
Figure 34
3.
4.
3.
source, gauge, and variable resistance.
Turn off the voltage source. Disconnect voltage
1.
2.
Middle position
High temp position
Edge of glass cover
Cold temp position
Temperature Gauge Check
The following procedure can be used to check the tem-
perature gauge and the gauge circuit:
1
1.
(Fig. 35) Turn ignition key to ON (do not start engine).
Disconnect wire from temperature sender on engine
2.
Temperaturegaugeneedleshouldremaininthecold
temp range.
3.
peraturesender.Thegaugeneedleshouldmovetoward
the high temp position.
Groundthewirethatwasdisconnectedfromthetem-
2
Figure 35
1.
Temperature sender
2.
Alternator
4.
Reconnect wire to temperature sender.
Electrical System (Rev. A)
Page 5 -- 22
Groundsmaster 4500--D/4700--D
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