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TM 10-3930-669-34
(1)
Resistance and Continuity Measurements.
(a)
Connect positive (+) multimeter lead to multimeter VOLT-OHM connector. Connect negative (-)
multimeter lead to multimeter COM connector. When the multimeter leads are separated or are measuring a circuit with
no continuity, the multimeter will indicate "OL" (Over Limit) on its display. When multimeter leads are connected together,
multimeter should display "0," indicating a continuous circuit with no (zero) resistance.
(b)
Set multimeter function/range switch to the desired ohm position. If the amount of the expected
resistance is not known, set the switch to the highest range, then reduce until a satisfactory reading is obtained. If only
continuity is to be checked, without regard to resistance, set the multimeter function/range switch to the highest ohm
range.
(c)
Always turn the main power switch to the OFF position before connecting multimeter leads to a circuit
unless instructed to do otherwise in the troubleshooting procedure.
(d)
Connect multimeter leads to the circuit being checked. The multimeter leads must only contact the
point of measurement to ensure an accurate reading.
(e)
Read the resistance value displayed on the multimeter.
(f)
Disconnect multimeter leads from circuit.
(g)
Turn off multimeter.
(2)
Voltage Measurements. The forklift is equipped with a 24-volt electrical system. Troubleshooting
procedures will reference 24 vdc measurements; however, these values can vary depending on battery conditions and if
the engine is running or not. If battery voltages are below 20 vdc, charge batteries.
(a)
Connect positive (+) multimeter lead to multimeter VOLT-OHM connector. Connect negative (-)
multimeter lead to multimeter COM connector.
(b)
Set the function/range switch to the setting closest to, but not below, 24 vdc. If multimeter is equipped
with a DC-AC switch, set the switch to the DC position. (c) Always turn the main power switch to the OFF position before
connecting multimeter leads to a circuit unless instructed to do otherwise in troubleshooting procedure.
(d)
Connect the positive (+) multimeter lead to the circuit being tested. Connect the negative (-)
multimeter lead to a known good ground.
(e)
Set main power switch to ON position and operate any other controls necessary to energize the circuit
being tested.
(f)
Read the voltage value displayed on the multimeter.
(g)
Set the main power switch to the OFF position. Return other controls to their "at rest" positions.
(h)
Disconnect multimeter leads from circuit.
(i)
Turn off multimeter.
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