ELECTRICAL GROUND POINTS

TM 9-2320-312-24-1

ELECTRICAL GENERAL MAINTENANCE INSTRUCTIONS - CONTINUED

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ELECTRICAL GROUND POINTS

NOTE

Good electrical ground points are essential for the proper functioning of the electrical system. Ground points

on electrical components and the frame of vehicle must be maintained in a clean and secure condition to

minimize electrical problems.

Remove nut, locknut, lockwasher, screw etc. connecting ground wire or ground cable to ground point on electrical com-

ponent or threaded stud on vehicle frame.

If necessary, clean dirt from ring terminal, surface of electrical component, ground point, and all mounting hardware

with detergent, water, and a scrub brush.

Remove any corrosion or rust with a wire brush and abrasive cloth.

Replace defective mounting hardware. Replace defective ring terminal. (Refer to Ring Terminal Repair).

Install ground wire or ground cable to ground point with mounting hardware and tighten securely.

Apply one or more coats of insulating varnish to ground connections.

MULTIMETER USAGE

General. The digital multimeter 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 voltage levels at any point

in the electrical system.

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.

Zero the Multimeter.

(1)

Set multimeter ON/OFF switch (22) to ON position.

(2)

Press OHMS FUNCTION switch (21).

(3)

Press LOWEST VOLTAGE/OHMS selector switch (23).

(4)

Touch black and red probes (24 and 25) together and check for a zero reading on digital readout (20).

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