Mercury E3AZ-12A646-A Relay

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Many vehicle accessories utilize relays for transmitting electrical signals. To check if the relay is fine, take it out of the car and test for continuity across the power circuit terminals. Place a fused jumper wire between one control circuit terminal and the positive battery terminal and another jumper wire between the other control circuit terminal and ground. Check for continuity across the power circuit terminals. It requires replacement if any of these tests are failed by the relay.

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.

In late-model vehicles, the relay center is located in the engine compartment, near the brake master cylinder.

They are usually numbered 87A, 87B, 87C, and so on.

Most of the relays used are of a type often called 'ISO' relays, which refers to the International Standards Organization.

The relays are marked as an aid to help you determine which terminals are the control circuit and which are the power circuit. Most relays are marked on the outside to easily identify the control and power circuits.