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INTRODUCTION TO LOGIC TREE TROUBLESHOOTING (CONT)
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TROUBLESHOOTING - TM-10-3930-673-340032
TM 10-3930-673-34
(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 12 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 the troubleshooting procedure 15.
(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.
2-5

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