TM 5-4520-253-13
I N S P E C T C O N T R O L B O X W I R I N G H A R N E SS
TEST EQUIPMENT: Volt ohmmeter
GENERAL SAFETY INSTRUCTIONS:
Power off.
Heater cool.
INSPECTION:
1.
2.
3.
4.
5.
6.
Death or serious injury could occur if precautions are not
taken when maintaining this equipment. Position HEATER-
OFF-FAN switch to OFF, remove power cable plug from
POWER RECEPTACLE, and ground capacitors C 1 and C2
prior to gaining access to heater compartments. Terminals
of capacitors are accessible at end cover of combustion
blower. Always disconnect power cable before making con-
tinuity tests or before repairing heater. Always have
another person standing by who is trained in electric shock
first aid.
Allow sufficient time for heater to cool to room tempera-
ture before gaining access to heater compartments.
Check all leads (1) for cracked or burned insulation.
Check for broken or damaged terminals (2) on harness wires.
Check for secure connection to harness plug (3).
Check for broken soldered connections (4) at
HEATER-OFF-FAN switch.
Check each harness wire for continuity.
Repair control box harness as needed.
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