Tools Required

J 39200 Digital Multimeter

1. Disconnect both ends of each spark plug wire you are testing.

Ensure that the wire terminals are clean before proceeding.

2. Use the J 39200 on the high scale.
3. Connect an ohmmeter lead to each end of the wire.
4. Gently twist the wire while watching the ohmmeter reading.
5. If the ohmmeter reads above 30,000 ohms, no matter how long the wire is, or fluctuates from infinity to any value, replace the wire.