TM 10-3930-675-20-20111 00-8ELECTRICAL GENERAL MAINTENANCE INSTRUCTIONS - CONTINUED0111 00ELECTRICAL GROUND POINTSMany electrical problems are the result of poor ground connections. Ensure that ground connections are good by per-forming the following steps:WARNINGAlthough master battery switch must be ON to test electrical circuit voltage, turn master battery switch toOFF position before performing resistance tests or replacing parts. Failure to follow this warning may resultin 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 USAGE1.General. The digital multimeter (Item 18, WP 0204 00) is used to troubleshoot the electrical system of the vehicle. themultimeter’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.ContinuityTests. Continuity tests are performed to check for breaks in a circuit (such as a fuse, switch, light bulb orelectrical cable).NOTEIf digital readout will not zero properly, replace batteries and repeat zeroing procedure. If digital readout willnot 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). 424446485049
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