TM 10-3930-641-20
(Sheet 5 of 8)
ELECTRICAL TEST EQUIPMENT (CONT)
OHMS SCALE (CONT)
TESTING FOR SHORT CIRCUITS
A short or short circuit occurs when two circuits that should not
be connected have contact with each other. A short also occurs
when a circuit that should not touch ground has contact with
ground. To check for shorts, do the following steps:
A Set up and zero the multimeter.
Failure to do the following step can damage the multimeter.
B
Disconnect the circuit being tested. To be safe, disconnect the
battery ground strap.
Connect one probe to one circuit and the other prcbe to the
C
other circuit or ground (if checking for a short to ground). The
examp~e 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 0 on the top scale,
the circuits are short circuited.
If the needle doesn't move, the circuits are not short circuited.
If needle jumps or flickers, the circuits are intermittently short
circuited.
Go on to Sheet 6
