Mitsubishi Montero 1987 Service Manual Page 35

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  • TROUBLESHOOTING
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WIRING HARNESS
- Troubleshooting
8-15
1660227
Black lead wire
Ground y
1680228
Normal open (NO) type
OFF
ax
Current does not flow
ON
Current flows
Normal close (NC) type
OFF
l-2
Current flows
ON
-op--
IX
Current does not flow
1680229
pm
I
3. Jumper wire
A jumper wire is used to close an open circuit. Never use one
to connect a power supply directly to a load.
4. Voltmeter
A voltmeter is used to measure the circuit voltage. Normally,
the positive (red lead) probe is applied to the point of voltage
measurement and the negative (black lead) probe to the body
ground.
5. Ohmmeter
An ohmmeter is used to.check continuity or measure resis-
tance of a switch or coil. If the measuring range has been
changed, the zero point must be adjusted before measure-
ment.
CHECKING SWITCHES
In a circuit diagram, a switch is represented by a symbol and in the
idle state.
1. Normal open or normal close switch
Switches are classified into those which make the circuit open
and those which make the circuit closed when off.
#vision
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