DIRECT SUPPORT TROUBLESHOOTING INTRODUCTION - CONTINUED
WAR N I N G
This is the symbol for a warning statement. If you see the word WARNING above a question on the left-
hand page, look on the right-hand page for the text of the message. WARNINGs describe a situation which
could cause severe injury or death to personnel.
CAU T I ON
This is the symbol for a caution statement. If you see the word CAUTION above a question on the left-hand
page, look on the right-hand page for the text of the message. CAUTIONs describe a situation which could
cause damage to equipment.
N OT E
This is the symbol for a note. Notes are located directly above the test to which they prefer. NOTES provide
additional information for performing a test.
Measurements Required for Troubleshooting.
CAU T I ON
voltage at connectors or damage to equipment can result.
(a) Connect red test lead to Volt-Ohm input connector and black lead to COM input connector on meter.
(b) Set the function/range switch to the desired ohm position. If the magnitude of the resistance is not
known, set the switch to the highest range, then reduce until a satisfactory reading is obtained.
(c) If the resistance being measured is connected to a circuit, turn ENGINE switch OFF.
(d) Connect test leads to the circuit being measured. When measuring high resistance, be careful not to
contact adjacent points, even if they are insulated. Some insulators have a relatively low insulation
resistance which can affect the resulting measurement.
(e) Read the resistance value on the digital display.
(a) Place the function/range switch in any ohm range.
N OT E
Some meters show "l+m", or simply "l" when function/range switch is in any ohm position.
(b) Connect the red test lead to the Volt-Ohm input connector and black lead to COM input connector on
the meter. When the test leads are separated or measuring an out-of -range resistance, the digital dis-
play will indicate "OL" (Over Limit).
(c) Put one test probe at one end of the wire or circuit to be tested. Use the other test lead to trace the cir-
cuit. When continuity is established, an ohm symbol will appear in the upper left corner of the digital
display. If contact in the wire is maintained long enough (about 1/4 of a second), the OL will disap-
pear and the resistance valve of the wire or circuit will appear next to the symbol.
(d) IF your multimeter does not work in this manner, learn how it operates before performing trouble-