Ford F8OZ-14N089-AA Relay

In the fuel injection system of the vehicle and horns, the starter, the fog lamps, and many other electrical appliances in the car, relays are used to transference electrical stimuli to the appliance. Relays control a low current control circuit to switch on or off a high current power circuit, and therefore an unreliable relay will cause the relevant component not to work as required. Main and additional relays are located in the engine compartment, together with other electrical equipment; the underhood power center is situated near the battery and includes relays and high amperage fuses. Some cars of the late model use a relay box near the brake master cylinder along with relays for air conditioner WOT cutout, fuel pump, PCM power, and PCM power diode. In a case of suspected faulty relay it can be unbolted and checked, there is onboard procedure or check by the local service provider. In case of relays with short or open circuits, these must be replaced as a complete assembly. For proper hook-ups while testing a relay, one needs to look at wiring diagrams; where these are not available, a set of details noted follows in the information list. Typically relays come in type with two terminals for the control circuit which is connected to the relay coil, and the rest of the terminals for the power circuit which closes internally when the coil is energized. They are normally labelled so that control and power circuits can easily be distinguished from one another. To test, click the relay and ground the terminal on the other side of the circuit in the case there will be no continuity between terminal 30 and 87. Then add a fused jumper wire from one of the control circuit terminals to the positive battery terminal and another wire from the second control circuit terminal to ground; the relay should click. If it does not, try flipping the jumper wires. When the jumper wires are connecting, you should ground continuity between the power circuit terminals, and the continuity reading should be now between 30 and 87 terminals. If the relay does not pass any of these tests it is recommended that it should be replaced.

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. Most relays are mounted in the engine compartment fuse/relay box, with some specialized relays located above the interior fuse box in the dash. If a faulty relay is suspected, it can be removed and tested using the procedure below or by a dealer service department or a repair shop. Defective relays must be replaced as a unit. Most of the relays used in these vehicles are of a type often called "ISO" relays, which refers to the International Standards Organization. The terminals of ISO relays are numbered to indicate their usual circuit connections and functions. There are two basic layouts of terminals on the relays used in these vehicles. Two of the terminals are the relay control circuit and connect to the relay coil. The other relay terminals are the power circuit. When the relay is energized, the coil creates a magnetic field that closes the larger contacts of the power circuit to provide power to the circuit loads. Terminals 85 and 86 are normally the control circuit. If the relay contains a diode, terminal 86 must be connected to battery positive (B+) voltage and terminal 85 to ground. If the relay contains a resistor, terminals 85 and 86 can be connected in either direction with respect to B+ and ground. Terminal 30 is normally connected to the battery voltage (B+) source for the circuit loads. Terminal 87 is connected to the circuit leading to the component being powered. If the relay has several alternate terminals for load or ground connections, they usually are numbered 87A, 87B. 87C, and so on. Use an ohmmeter to check continuity through the relay control coil. Connect the meter one check; then reverse the ohmmeter leads and check continuity in the other direction. If the relay contains a resistor, resistance will be indicated on the meter, and should be the same value with the ohmmeter in either direction. If the relay contains a diode, resistance should be higher with the ohmmeter in the forward polarity direction than with the meter leads reversed. If the ohmmeter shows infinite resistance in both directions, replace the relay. Remove the relay from the vehicle and use the ohmmeter to check for continuity between the relay power circuit terminals. There should be no continuity between terminal 30 and 87 with the relay de-energized. Connect a fused jumper wire to terminal 86 and the positive battery terminal. Connect another jumper wire between terminal 85 and ground. When the connections are made, the relay should click. 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.

Many electrical fixture or spots in the vehicle like the fuel injection system, the horn, the starter, and the fog lamps uses relays to switch signals to the needed terminal. Relays switch by a low current control circuit for a high current power circuit and an undesirable relay will hamper the functioning of the related component. Relays are fitted in the engine bay, and those that are left-hand side of the car in the vicinity of the inner fenderwell contains mini fuses, cartridge fusible links, relays and circuit breakers; other relays are installed at other parts of the car as well. If a faulty relay is suspected, it can be unbolted and checked in accordance with this procedure, or taken to a dealer service department or auto repair shop; bad relays must be replaced as a single unit. In fact, before testing a relay, it is advisable to refer to the wiring diagram of the circuit to know the correct connections. Normally, two of them are terminals of the control circuit allowing for connection to the relay coil and two other are power circuit terminals which make internal connection when the control circuit coil is energized. The most relays are labeled to make identification of the control and power circuits possible. To test, simply disconnect the relay and can check for continuity between the power circuit terminals, there must be no connection between the terminal 30 and 87. Then connect a fused jumper wire from one of the control circuit terminal to the positive lead of the battery and another fused jumper wire from the second terminal of the control circuit to the negative terminal; the relay should click when connected. Otherwise, it may just 'not click' and then the jumper wires may need to be flipped around. Then probe and connect the jumper wires, and test if there is continuity between the power circuit terminals, between 30 and 87, there should be continuity in this one. In the case of failure of any of these tests, then the relay should be replaced.

Various electrical gadgets in the vehicle for instance relevant injection system, horns, starter and the fog lamps employ relays to send an electrical signal to the component. Relay controls the low current control circuit to govern the high current power circuit, and when the relay is faulty the particular device cannot function as required. Bulk of relays can be found at the fuse and relay box and if a relay is deemed abnormal it can be taken out for testing or better yet to the dealer service department as all bad relays should be replaced. The relays mainly in use are the ISO relays in which the provision for the circuit connections has been numbered and each having its specific function. Two of the pins are used for the control circuit that connects to the relay coil, the rest are pins in the power circuit. When energised the coil produces a magnetic field to close the larger contacts of the power circuitry to supply power to the loads. Normally terminals 85 and 86 are for the control circuit definite connection is necessary if Diode or Resistor is provided is provided. Terminal 30 allows the battery voltage to be connected , while terminal 87 connects to the ground of the circuit in question. In the testing of the relay, the sensitivity can be checked by measuring the resistance through the control coil and comparing it with the correct resistance in both directions. In the same way, it is permissible for the continuity between terminal 30 and 87 to be disrupted when the relay is without energy. Jumper wires should be connected to the proper terminal and the battery to check if the relay made a clicking sound; continuity test should also be performed and the power circuit terminals are should also be tested. If any of these tests show failure the relay should be changed.

Key aspects of the fuel injection system, horns, starters and fog lamps in the vehicle use relays where a low current control circuit is used to switch on the high current power circuit required to activate the component. A defective relay will not allow the operation of the related component, and several of them are installed in the engine compartment and interior fuse/relay boxes. If there is reason to believe a relay is bad, it can be pulled and checked, by either a prescribed method or the dealer. Most relays in these vehicles are ISO relays, which have terminal numbers suggesting the circuit connections and function of the relays; there are two general terminal configurations on these relays. The control circuit of the switch is configured to the relay coil, while the other terminals are configured in the power circuit to make the coil produce a magnet which in turn switches on the power circuit electricity. More often terminal 85 and 86 constitute the control circuit with special connections when a diode or a resistor is connected. Terminal 30 terminal of the alternator is connected to the battery voltage source, while terminal 87 is connected to the ground side of the circuit. A check on continuity of the relay working through the control coil available in the circuit can be used to check on the resistance in both directions, whether 'n' and 'n+1'. Further, there should be no continuity between terminal 30 and 87 when the relay is out of phase. When the correct terminals and the battery have been shorted by the jumper wires, the relay should click and when continuity is checked for between terminals 30 and 87, there should be continuity. If any tests show failure then relay should be replaced.

There are several electrical accessories that are fitted on the vehicle; the fuel injection, horns, starter and the fog lamps all use relays to switch on or off as well as switch the electrical signal to the relevant components. It is a combination of a control circuit, which is a low current path and a power circuit which is a high current path. A faulty relay will lead to the wrong functioning of the linked element. Commonly used place of mounting of relays is the engine compartment area and interior fuse or relay compartments.

Many electrical fixture or spots in the vehicle like the fuel injection system, the horn, the starter, and the fog lamps uses relays to switch signals to the needed terminal. Relays switch by a low current control circuit for a high current power circuit and an undesirable relay will hamper the functioning of the related component. Relays are fitted in the engine bay, and those that are left-hand side of the car in the vicinity of the inner fenderwell contains mini fuses, cartridge fusible links, relays and circuit breakers; other relays are installed at other parts of the car as well. If a faulty relay is suspected, it can be unbolted and checked in accordance with this procedure, or taken to a dealer service department or auto repair shop; bad relays must be replaced as a single unit. In fact, before testing a relay, it is advisable to refer to the wiring diagram of the circuit to know the correct connections. Normally, two of them are terminals of the control circuit allowing for connection to the relay coil and two other are power circuit terminals which make internal connection when the control circuit coil is energized. The most relays are labeled to make identification of the control and power circuits possible. To test, simply disconnect the relay and can check for continuity between the power circuit terminals, there must be no connection between the terminal 30 and 87. Then connect a fused jumper wire from one of the control circuit terminal to the positive lead of the battery and another fused jumper wire from the second terminal of the control circuit to the negative terminal; the relay should click when connected. Otherwise, it may just 'not click' and then the jumper wires may need to be flipped around. Then probe and connect the jumper wires, and test if there is continuity between the power circuit terminals, between 30 and 87, there should be continuity in this one. In the case of failure of any of these tests, then the relay should be replaced.

In the fuel injection system of the vehicle and horns, the starter, the fog lamps, and many other electrical appliances in the car, relays are used to transference electrical stimuli to the appliance. Relays control a low current control circuit to switch on or off a high current power circuit, and therefore an unreliable relay will cause the relevant component not to work as required. Main and additional relays are located in the engine compartment, together with other electrical equipment; the underhood power center is situated near the battery and includes relays and high amperage fuses. Some cars of the late model use a relay box near the brake master cylinder along with relays for air conditioner WOT cutout, fuel pump, PCM power, and PCM power diode. In a case of suspected faulty relay it can be unbolted and checked, there is onboard procedure or check by the local service provider. In case of relays with short or open circuits, these must be replaced as a complete assembly. For proper hook-ups while testing a relay, one needs to look at wiring diagrams; where these are not available, a set of details noted follows in the information list. Typically relays come in type with two terminals for the control circuit which is connected to the relay coil, and the rest of the terminals for the power circuit which closes internally when the coil is energized. They are normally labelled so that control and power circuits can easily be distinguished from one another. To test, click the relay and ground the terminal on the other side of the circuit in the case there will be no continuity between terminal 30 and 87. Then add a fused jumper wire from one of the control circuit terminals to the positive battery terminal and another wire from the second control circuit terminal to ground; the relay should click. If it does not, try flipping the jumper wires. When the jumper wires are connecting, you should ground continuity between the power circuit terminals, and the continuity reading should be now between 30 and 87 terminals. If the relay does not pass any of these tests it is recommended that it should be replaced.

Most relays are mounted in the engine compartment and interior fuse/relay boxes.

Always replace a fuse with one of an identical rating. Never substitute a fuse of a higher rating or make temporary repairs using wire or metal foil, as this could result in more serious damage or even fire. The fuse rating is stamped on top of the fuse, and never replace a fuse more than once without tracing the source of the trouble.

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.

If the relay doesn't click during the test, you may try swapping the jumper wires on the control circuit terminals, as polarity can be critical on some relays. If it still doesn't click, it's likely defective and should be replaced.

Terminal 87 is connected to the circuit leading to the component being powered. If the relay has several alternate terminals for load or ground connections, they are usually numbered 87A, 87B, 87C, and so on.