Spark Plug Wire Resistance Check
- Remove distributor cap. Disconnect spark plug end of suspected wire or wires. Connect ohmmeter leads to spark plug terminal and terminal inside cap. DO NOT puncture wire when measuring resistance.
- If resistance is less than 5,000 ohms per inch, inspect wires for damage, or spark plug for fouling. If resistance is more than 5,000 ohms, disconnect suspect wire from cap and connect ohmmeter to each end of wire.
- If resistance drops, inspect distributor cap and wire terminals for damage. Repair as necessary. If resistance does not drop, replace wire(s).