ELECTRICAL TROUBLESHOOTING (continued)

TM 9-2330-202-14&P

4-14.

ELECTRICAL TROUBLESHOOTING (continued).

The multimeter is used throughout electrical troubleshooting. When using the multimeter, make sure it is used

with a probe kit.

When performing a continuity test, make sure all connectors and/or leads are disconnected from their

components. Probe the pins (or sockets) with a multimeter.

When probing has been completed, place the red lead on the second pin (or connector) and probe with the black

lead in the same order. Do this until every pin has been probed with the red lead of the multimeter. Then place

the black lead of the multimeter on the connector and place the red lead on each pin (or socket) on the connector.

If continuity is present between any two points, a short exists. Shorts must be repaired in order to continue any

operation.

If instructed in a procedure to skip a pin (or socket) during a continuity test, it is because the pin (or socket) is not

used or is shielded.

When a repair or replacement of a lead or wiring harness has been done, do the continuity test again to make

sure the problem has been corrected.

When performing a continuity check, connect the meter probes to both terminals of the circuit you are testing.

Read the meter. Interpret the results. If the needle swings over to near 0 on the top scale, the circuit has

continuity. If the needle does not move, the circuit is open. If the needle jumps or flickers, there is a loose

connection.

Check light bulbs for cracks or discoloration. Check the continuity of a light bulb by placing one probe of the meter

to the metal button base connection of the bulb and one probe to the metal side of the base. If the meter needle

swings over to 0 on the top scale, the circuit has continuity. If the meter needle does not move, the circuit is open,

indicating a defect.

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