MAINTENANCE OF ELECTRICAL SYSTEM.

TM 5-4120-386-14

4-15. MAINTENANCE OF ELECTRICAL SYSTEM.

The electrical system is made up of:

Heater Thermostatic Switch

Heater Elements

Control Module and Components

Junction Box and Components

High/Low Pressure Cutout Switches

Wiring Harness

Electric assemblies and groups of associated components are covered

in separate paragraphs.

Disconnect air conditioner power supply before doing

maintenance work on the electrical system.

Testing and inspecting the electrical system

(1)

Troubleshooting procedures for testing the electrical system to

isolate causes of trouble are discussed in Table 4-1. More detailed test

information is contained in specific paragraphs about the electrical

components.

(2)

Use a continuity tester or a multimeter set on low-resistance range

to test for continuity.

Use an insulation tester or a multimeter set on a high-resistance

(3)

range to test for short circuits between the circuit in a component and the

outside casing of the component.

When testing an electrical component, check for visible damage, and

(4)

inspect all wiring in the area for damage or loose connections.

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