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Ignition System Wires
This test measures the resistance of
spark plug and coil tower wires while they are
being flexed. This test can be used for
distributorless ignition systems (DIS) provided
the system does not mount the ignition coil
directly on the spark plug.
Test Procedure:
1. Remove ignition system wires one at a
time from engine.
Always grasp ignition system wires on
the boot when removing.
Twist the boots about a half turn while
pulling gently to remove them.
Refer to vehicle service manual for
ignition wire removal procedure.
Inspect ignition wires for cracks, chaffed
insulation, and corroded ends.
NOTE: Some Chrysler products use a
positive-locking terminal electrode spark
plug wire. These wires can only be
removed from inside the distributor cap.
Damage may result if other means of
removal are attempted. Refer to vehicle
service manual for procedure.
NOTE: Some spark plug wires have sheet
metal jackets with the following
symbol: . This type of plug wire
contains an air gap resistor and can only
be checked with an oscilloscope.
2. Insert BLACK test lead into the COM
test lead jack. (See Fig. 22.)
Fig. 22
Red
3. Insert RED test lead into the
V
test
lead jack.
4. Connect RED test lead to one end of
ignition wire and BLACK test lead to
other end.
5. Turn multimeter rotary switch to 200KΩ
range.
6. View reading on display while flexing
ignition wire and boot in several places.
Typical resistance range is 3KΩ to 50KΩ
or approximately 10KΩ per foot of wire.
Refer to vehicle service manual for your
vehicles resistance range.
As you flex ignition wire, the display
should remain steady.
7. Test Results
Good Ignition Wire: Display reading is
within manufacturers specification and
remains steady while wire is flexed.
Bad Ignition Wire: Display reading
erratically changes as ignition wire is
flexed or display reading is not within
manufacturers specification.
Spark Plug Wire
Black