ELECTRICAL SYSTEM - VOLTAGE DROP TEST

TM 5-5420-279-23

5 - 144 ELECTRICAL SYSTEM - VOLTAGE DROP TEST

This task covers:

a. Test

INITIAL SETUP:

Tools Required

Tool Kit, General Mechanic's, Automotive (GMTK)

Multimeter (Shop Set Contact Maintenance Truck HMMWV)

Material Required

None

Equipment Conditions

Multimeter Set to Volts

Test

(1)

Disconnect connector from the component (switch, solenoid, junction box, etc) at the

working end of the circuit.

(2)

Check connector terminal(s) for damage; repair or replace connector as necessary.

(3)

Set launch system conditions that will create voltage at the working end of the cable.

(4)

Check the required voltage at the working end of the cable.

If the required voltage is not measured at the working end of the cable, go to step (5).

b. If the required voltage is measured at the working end of the cable, the fault has not

been isolated. Continue with the fault isolation tests or notify supervisor.

(5)

Disconnect the first connector in line from the working end of the cable to the power

source.

(6)

Check for the required voltage at the working end of the cable.

If the required voltage is not measured at the working end of the cable, go to step (7).

d. If the required voltage is measured at the working end of the cable, a fault is in the

section of the cable most recently disconnected. Repair or replace the cable and perform

the continuity test again.

(7)

Repeat steps 4 and 5 until all sections of the suspect cable are tested.