b. Cleaning and Inspection.
(7) Place the switch in REVERSE position.
(1) Clean voltmeter with a clean. lint-free
(8) Repeat tests as in (6) above. Continuity
should not be indicated between the center and
cloth.
lower terminals and continuity should be indicated
(2) Inspect voltrneter for damage and loose
between the center and upper terminals.
terminals and replace a defective voltmeter.
(9) Replace a defective switch.
b. Remoual. Remove the polarity switch as
illustrated in figure 3-19.
illustrated in figure 3-19.
3-31. Running Time Meter
c. Cleaning and Inspection.
a. Removal. Remove the running time meter as
(1) Clean switch with a clean, lint-free cloth.
illustrated in figure 3-19.
(2) Inspect for damage and loose terminals
b. Cleaning and Inspection.
and replace a defective polarity switch.
(1) Clean the running time meter with a clean,
d. Installation. Install the polarity switch as
lint-free cloth.
illustrated in figure 3-19.
(2) Inspect for damage and loose terminals
3-33. D. C. Ammeter
and replace a defective running time meter.
a. Remova/. Remove the D. C. ammeter as
C. lnsta/lation. Install the running time meter as
illustrated in figure 3-19.
illustrated in figure 3-19.
b. Cleaning and Inspection.
3-32. Polarity Switch
(1) Clean the direct current ammeter with a
a. On-Equipment Testing.
clean, lint-free cloth.
(1) Tag leads and note position of jumpers on
(2) Inspect for damage and loose terminals
polarity switch.
and replace a defective ammeter.
(2) Disconnect leads and jumpers from
c. Installation. Install the D. C. ammeter as
switch.
illustrated in figure 3-19.
(3) Place switch in OFF position.
3-34. A. C. Voltage Adjusting Rheostat
(4) Use a multimeter and test for continuity
between each center terminal and all other ter-
a. Removal. Remove the rheostat as illustrated
minals. No continuity should be indicated.
in figure 3-19.
(5) Place the switch in the STRAIGHT
b. Testing. Use a multirneter and test the
rheostat and the direct current resistance element
positiion..
(6) Use a multirneter and test between each
for smooth operation throughout the range. `rest
the rheostat for resistance of 121.5 plus or minus 5
center terminal and its corresponding lower ter-
percent and replace a defective rheostat.
minal. Continuity should be indicated. Then, test
c. Installation. Install the rheostat as illustrated
between each center terminal and its corresponding
in figure 3-19. Refer to wiring diagrams (fig. 1-1
upper terminal. No continuity should be indicated.
and 1-21.
Section III. SHOP BODY
3-35. Wiring
c. Testing 24-Volt Wiring Harness. Refer to the
appropriate wiring diagram and test the harness for
a. General. Check insulation for cracks and
continuity in the same manner as described in
frayed places. Pay particular attenticn to places
b above.
where, wires pass through holes in the frame or over
d. Replacement
sharp metal edges. If any wiring is found to be
(1) Tag and disconnect all electrical leads as
defective. replace it following its respective wiring
necessary.
diagram (TM 5-4940-225-12). Solder all terminal
(2) To replace a wire that is not part of a
connrtions to insure good electrical contact. If the
wiring harness, disconnect it at each end and install
defective wire is part of a rubber molded wiring
a new wire of the same identification number as the
harness. and cannot
be replaced
without
one removed.
disassembly,. replace the harness.
(3) If a defective wire is part of a wiring
b. Testing 110-Volt Wiring. Test the electrical
harness or cable assembly t h a t cannot be
leads for continuity. Disconnect each end of the
reassembled, replace the entire harness or cable
wire from the components to which it is connected
assembly.
(refer to wiring diagram). Check for continuity and
(4) Connect lead as tagged in (1), above.
replace any defective wire with the same size wire
at removed. Reinstall the circuit tag number.
3-27
