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TM 10-3930-643-34
GENERAL MAINTENANCE PROCEDURES. (cont)
2-13.
Electrical Repair. (
(a) Set up and zero the
Failure to do the following
damage the multimeter.
(b) Disconnect the
from the power source. To
the battery ground strap.
cont)
multimeter.
steps
can
circuit being tested
be safe,
disconnect
(c) Connect one probe to one circuit and the other probe to the other
circuit or ground (if checking for a short to ground).
The example shows a
check to see if wire A is shorted to wire B in the wiring harness.
(d) Observe needle movement.
If the needle swings to the far right
over the O on the top scale, the circuits are short circuited.
If the needle doesn’t move, the
jumps or flickers, the circuits
(4) Measuring resistance.
(a) Set up and zero the
circuits are not short circuited.
If needle
are intermittently short circuited.
To measure resistance, do the following steps:
multimeter.
Failure to
damage the
(C) If
different than
switch to that
(b) Disconnect the circuit being tested
from the power source.
To be safe, disconnect
the battery ground strap.
do the following step can
multimeter.
the test calls for an ohms range
RX1 or X1,
set
the selector
range (RX10 or X10).
Zero the
meter every time you change ranges.
(d) Connect the probes across the
circuit or item to be measured.
The example
shows measuring the
three-wire cable.
2-12
resistance of one wire in a
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