Mercury E7SZ-13A025-A RELAY

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Several electrical accessories in the vehicle, such as the fuel injection system, horns, starter, and fog lamps use relays to transmit the electrical signal to the component. Relays use a low-current circuit (the control circuit) to open and close a high-current circuit (the power circuit). If the relay is defective, that component will not operate properly. The various relays are mounted in the engine compartment and several locations throughout the vehicle. If a faulty relay is suspected, it can be removed and tested using the procedure below or by a dealer service department or other repair shop. Defective relays must be replaced as a unit. It's best to use the wiring diagram for the circuit to determine the proper hook-ups for the relay you're testing. However, if you're not able to determine the correct hook-up from the wiring diagrams, you may be able to determine the test hook-ups from the information that follows. On most relays, two of the terminals are the relay's control circuit (they connect to the relay coil which, when energized, closes the large contacts to complete the circuit). The other terminals are the power circuit (they are connected together within the relay when the control-circuit coil is energized). 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. Remove the relay from the vehicle and check for continuity between the relay power circuit terminals. There should be no continuity between terminal 30 and 87. 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. On some relays, polarity may be critical, so, if the relay doesn't click, try swapping the jumper wires on the control circuit terminals. With the jumper wires connected, check for continuity between the power circuit terminals. Now, there should be continuity between terminals 30 and 87. If the relay fails any of the above tests, replace it.