Main Relay
- Disconnect negative battery cable. Remove main relay. Main relay is located under instrument panel attached to side of heater case. Using an ohmmeter, measure resistance between terminals No. 2 and 4. See Figure .
- Continuity should not be present. If continuity is present, replace relay. Measure resistance between terminals No. 1 and 3. Resistance should be 61-75 ohms. If resistance is not as specified, replace relay. Apply battery voltage and ground to terminals No. 2 and 4. Continuity should now be present between terminals No. 1 and 3. If continuity is not present, replace relay.