Fuel Gauge
The fuel gauge can be tested using a new gauge as a
substitute or with the use of a DC voltage source and a
variable resistance box (see Fuel Sender Testing in this
section for additional information).
Testing
1.
Make sure ignition switch is OFF. Remove key from
ignition switch.
2.
Disassembly in the Service and Repairs section of
Chapter 7 -- Chassis).
Locate fuel gauge for testing (see Steering Tower
VARIABLE
RESISTANCE
14
VDC + 0.01 VDC
CAUTION
+
--
Make sure the voltage source is turned OFF be-
fore connecting it to the electrical circuit toavoid
electrical shock and to prevent damaging the
gauge.
Figure 46
1
2
3.
Connect fuel gauge to the variable resistance and
DC voltage source (Fig. 46).
NOTE: When reading the gauge test point, there are
two white dots on the gauge face below the edge of the
glass cover for each test point. For each variable resist-
ance setting, the needle must be pointed between the
two white dots.
4.
Take test point readings (Fig. 47).
IMPORTANT: Allow circuit to warm up for at least 5
minutes before taking test readings.
A. Setvariable resistance to240ohms. Apply a14+
3
0.01
VDC to the circuit. The needle should point to
the left edge of the red area (empty).
Figure 47
B. Set variable resistance to 33 ohms. The needle
should point to the right edge of the green area (full).
1.
2.
Empty position
Full position
3.
Glass face edge
5.
source, gauge and variable resistance.
Turn off the voltage source. Disconnect voltage
6.
(see Steering Tower Assembly in the Service and Re-
pairs section of Chapter 7 -- Chassis).
Secure all removed components to steering tower
Groundsmaster 4100--D/4110--D
Page 5 -- 37
Electrical System
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