Ground Circuit Check
- Disconnect 3-wire distributor connector and 4-wire module connector. Check for dirt, corrosion or damage. Connect one ohmmeter lead to black wire in distributor connector and other lead to ground. Wiggle distributor grommet during measurement.
- Then connect ohmmeter leads to each end of black wire, between 4-wire and 3-wire connectors. Remove ohmmeter and reconnect connectors.
- If there is less than 1 ohm resistance, proceed to "Ignition Coil Circuit Check ". If more than 1 ohm resistance, check for loose, broken or missing distributor ground screw. Replace defective wires.