Operating instructions

TM 55-4920-394-13&P
Table 3-2. Inspection of Electrical Parts
PART INSPECT FOR
All equipment and General condition of parts; cracks, chips and
components breaks.
Mechanical action of moving parts.
Condition of terminals and connections.
Condition of leads and cables.
Lamps and indicators, for broken filaments or
bases. Indicator needles or cases.
Indicator Lights Apply 28Vdc to pins 1 and 2 with tested lamp
(part number 1822) in place. Lamp should light.
Apply 28Vdc to pins 1 and 3 with test lamp in
place. Depress test ring, and lamp should light
until test ring is released.
Panel and Apply 28Vdc to pins to check light and lamp.
Illumination lights Inspect socket and jewel.
Circuit Breaker Apply 28Vdc and check continuity with contacts actuated
and deactuated.
Toggle switches Apply 28Vdc and check continuity across terminals in
both open and closed positions.
Hourmeter Check counter cycling with an accurate chronometer
with pump on.
Apply 28Vdc and check cycling with a chronometer.
Fluid Gage Indicator at rest position at left of dial under
no current, moving to right to full indication
under power, with full tank, and dropping to
empty with tank empty.
Sending Unit Check terminals for clean, tight connections.
Check sending unit float for damage causing
leakage.
Apply 24Vdc with variable resistance, 0 to 30
ohms, for reading of "Empty" to "Full".
Motors Refer to paragraph 3-18 for inspection data.
Horn Apply 28Vdc to horn terminals to sound horn.
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