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TM 10-3930-630-12
4-49.
Wiring
electrical tape if possible.
a.  General.  Electrical wiring for the truck
(3) Replace
damaged
wires
and
terminals.
consists mainly of two harnesses.  A harness with a
(4) Tighten clamp mounting screws and
multiple plug connects the instruments and fuses on the
install missing clamps if necessary.
instrument panel Connection to the frame harness is
made with a matching multiple plug at the right side of
4-50.
Sending Units
the instrument panel Additional wires connect to the
horn, transmission neutral start switch, fuel level gage
a.  General.  The engine oil pressure gage,
and transmitter, and between instruments on the panel
The engine ignition and associated wiring are covered in
hourmeter, coolant temperature gage, and fuel level
their appropriate paragraphs.
gage are actuated by sending units mounted on the
b.  Inspection.
engine and fuel tank. Connections are made to the oil
and temperature gages through the frame wiring
CAUTION
harness.  Two wires connected by a quick-disconnect
coupling lead from the fuel tank to the fuel gage. The
fuel level gage sending unit is covered with the fuel
Before attempting any replacement or
tank.
repairs to the electrical system, refer to
b.  Oil Pressure Gage Sending Unit. The oil
paragraph 446 and disconnect the battery
pressure and hourmeter actuator sending units are
ground (negative) cable.
mounted on the engine crankcase on the left side below
(1) Check  electrical  connections  for
the air cleaner.
security.
(1) Inspection.  Open left side panel to
(2) Inspect wires for damage to insulation,
wire and terminals.
gain access to the oil pressure gage sending unit.
(3) Check clamp for secure mounting.
(a) Check  wire  connections  to
c.  Repair.
sending units
(1) Tighten
loose
connections
if
necessary.
(2) Cover  damaged  insulation  with
Figure 4-33. Oil pressure and hourmeter actuator sending units, installed view.
4-43

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