GENERAL TROUBLESHOOTING INSTRUCTIONS - continued

TM 10-3930-673-20-1

2-14. GENERAL TROUBLESHOOTING INSTRUCTIONS (CONT)

NOTE

The piece of electrical test equipment used will be referred to as the "multimeter." The multimeter's

red test lead will be referred to as the "positive (+) multimeter lead." The multimeter's black test

lead will be referred to as the "negative (-) multimeter lead."

If your multimeter does not operate in the way described in the following steps, learn how it

operates before performing troubleshooting.

Multimeter leads must remain in contact with the circuit being tested for a minimum of three

seconds to obtain a reading.

(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.

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.

instructed to do otherwise in the troubleshooting procedure.