Main Relay (Computer/Fuel System): Testing and Inspection

Terminal Identification And Ohmmeter Connection:

1. Check that a "clicking" sound is heard at the main relay when turning the ignition switch OFF and ON.
2. Apply 12 volts and a ground to terminals "A" and "B" of the main relay as shown in the diagram.
3. Check for continuity at the terminals with an ohmmeter. With 12 volts applied to the terminals, there should be continuity between terminals "C" and "D" of the main relay. With the voltage removed, there should be no continuity between terminal "C" and "D" of the main relay.