Mercury E7LY-8Z658-A Relay

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Most relays are marked on the outside to help identify the control and power circuits. Additionally, two of the terminals are typically the relay's control circuit, and the other terminals are the power circuit. The relay's marking and the wiring diagram for the circuit can aid in determining the correct hook-ups for testing.

Defective relays must be replaced as a unit.

If the relay is defective, that component will not operate properly.

To test a suspected faulty relay, follow these steps: Remove the relay from the vehicle. Check for continuity between the relay power circuit terminals (terminals 30 and 87). There should be no continuity between them. Connect a fused jumper wire between one of the two control circuit terminals and the positive battery terminal. Connect another jumper wire between the other control circuit terminal and ground. When the connections are made, the relay should click. Check for continuity between the power circuit terminals (terminals 30 and 87) again. There should be continuity between them now.