Testing For Open Circuits, High Resistance and Loose Terminals

Use an ohmmeter to check cables for opens, loose terminals or high resistance as follows:
1. Remove cable from spark plug.
2. Remove cable from cable clips.
3. Lift distributor cap from distributor with cables intact. Do not remove cables from cap.
4. Connect the ohmmeter between the spark plug end terminal and the corresponding electrode inside the cap.
- Make sure ohmmeter probes are in good contact.
- Resistance should be within tolerance shown in the cable resistance chart.
- If resistance is not within tolerance, remove cable at cap tower and check the cable.
- If resistance is still not within tolerance, replace cable assembly. Test all spark plug cables in the same manner.

To test the connection between the coil and distributor terminals:
1. Remove distributor cap.
2. Connect an ohmmeter between center contact in the cap and coil tower terminal.
- Resistance should be approximately 5,000 ohms.
- If resistance is not within tolerance, replace the cap.
- If no problems are found, refer to Testing For Spark At Coil.


SECONDARY IGNITION CABLE RESISTANCE
Minimum Maximum
250 Ohms per Inch 560 Ohms per Inch
3,000 Ohms per Foot 6,700 Ohms per Foot