Section II. ELECTRICAL COMPONENTS - TM-5-4120-394-BD0028

TM 5-4120-394-BD

Section II. ELECTRICAL COMPONENTS

4-4. General. Electrical circuits contain switches and protection devices. By-passing a failed switch or protection device

is a rapid repair but may create more damage. The circuit must be checked for shorts before by-passing a protection

device.

4-5. Switch Defective. Environmental Control Unit will not operate due to switch failure. This procedure will allow the

equipment to operate until switch replacement can be effected.

a. General Information.

(1) Limitations. High/low pressure switches, if shorted across, could effect the compressor and/or other

components.

(2) Personnel/time required.

1 soldier/0.3 hours.

(3) Materials/tools.

Electrical tape (Appendix C, Iteml0)

Duct tape (Appendix C, Item 10)

b. Procedural Steps.

(1) Locate switch.

(2) Disconnect both wires.

(3) Slide protective insulation boots back on the wires to expose the electrical connectors.

(4) Lay the two connectors side by side and secure with tape.

Record the BDAR action taken. When the mission is completed, as soon as practicable, repair the generator using

standard maintenance procedures.

4-6. Fuse or Circuit Breaker Failure. A short or overload in a circuit will cause the fuse to burn out or the circuit breaker

to trip. The circuit becomes inoperative. A temporary repair can be made by bypassing the protection device with straight

wiring or by replacing the fuse with tinfoil, wire, ball point pen spring, or similar conductor. Use of solder will provide some

amount of circuit protection. Damage to the equipment can occur when the circuits are not properly fused.

Section III. WIRING HARNESS

4-7. General. Wiring harnesses are normally replaced when extensive damage occurs. Because of improvements or

different configurations, replacement harnesses from other equipment of the same family may use some different style

connectors. Try to obtain harnesses from an identical model; however, connectors can be exchanged with the damaged

harness. The same procedure is followed to change a complete connector or splice a complete harness. If a wire is

damaged but the fault cannot be located, it should be replaced with a jumper wire.

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