TM 10-3930-675-20-2
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ELECTRICAL GENERAL MAINTENANCE INSTRUCTIONS - CONTINUED
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ELECTRICAL GROUND POINTS
Many electrical problems are the result of poor ground connections. Ensure that ground connections are good by per-
forming the following steps:
WARNING
Although master battery switch must be ON to test electrical circuit voltage, turn master battery switch to
OFF position before performing resistance tests or replacing parts. Failure to follow this warning may result
in injury to personnel and damage to parts or equipment.
a.
Remove screw, lockwasher, nut, etc. connecting ground wire terminal to vehicle ground point.
b.
If necessary, clean mounting hardware, wire terminal, and ground point with detergent and a scrub brush.
c.
Remove any rust or corrosion from ground point with a wire brush and abrasive cloth.
d.
Replace defective mounting hardware and wire terminal as necessary.
e.
Install wire terminal to ground point with screw, lockwasher, nut, etc. and tighten securely.
MULTIMETER USAGE
1.
General. The digital multimeter (Item 18, WP 0204 00) is used to troubleshoot the electrical system of the vehicle. the
multimeter’s ohms scale is used to test for continuity, shorts, and resistance and the voltmeter scale is used to test volt-
age levels at any point in the electrical system.
2.
Continuity Tests. Continuity tests are performed to check for breaks in a circuit (such as a fuse, switch, light bulb or
electrical cable).
NOTE
If digital readout will not zero properly, replace batteries and repeat zeroing procedure. If digital readout will
not zero after batteries have been replaced, notify your supervisor.
a.
Zero the Multimeter.
(1)
Set multimeter ON/OFF switch (46) to ON position.
(2)
Press OHMS FUNCTION switch (44).
(3)
Press LOWEST VOLTAGE/OHMS selector switch (48).
(4)
Touch black and red probes (49 and 50) together and check for a zero reading on digital readout (42).
42
44
46
48
50
49
