Spark Plug Wire Check
- Disconnect spark plug end of suspected wire or wires. Remove distributor cap. Measure resistance of spark plug wires by touching ohmmeter probes to each end of wire. Measure from inside distributor cap. If resistance is less than 5,000 ohms per inch, wire is okay.
- If resistance is more than 5,000 ohms per inch, remove wire from cap and measure resistance of wire only. If it is less than 5,000 ohms, wire is okay. Check distributor cap and spark plug terminal for corrosion. Also check spark plug. If more than 5,000 ohms, replace spark plug wire.