Mopar 4638094 Electrical Relay

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Some of the electrical accesses in the vehicle are the fuel injection system, horns, starter and fog lamps, and relays are used in their functioning as circuits in which low current control circuit opens and closes the high current power circuit. A defective relay will stop the intended component from working correctly; most of the relays are in the engine bay fuse/relay box with a few small ones above the interior fuse box in the dashboard. If a faulty relay is thought to be present, it is removed and checked, and where required, the relay as a sub-assembly is replaced. Practically all relays installed in these cars are ISO relays that feature terminals that are numbered with reference to the circuit connections and application, and they tend to come with two types of terminal arrangements. One set of the terminal of the control circuit is connected to the relay coil, the other set being part of the power circuit; when the coil is energized it forms a magnetic circuit which closes the larger contact to allow the supply. Terminals 85 and 86 are usually used to fulfill the role of the control circuit, and particular connections may be necessary if a diode or resistor is provided. Terminal 30 is associated with the battery voltage side for circuit loads and Terminal 87 is associated with the ground side, with other terminal numbers for other connections. In order to check continuity through the relay control coil, an ohmmeter should be used with proper polarity and the resistance value should be checked and is indicates the relay status. The relay power circuit terminals should have no continuity when the circuit is de-energized, Upon connecting a fused jumper wire to terminal 86 and the positive battery terminal there should be a clicking sound from the relay. If continuity is present between terminals 30 and 87 with the relay energized it passes the test; if not the relay should be replaced.

Several electrical circuits in the vehicle that draw heavy amperage utilize relays to transmit current to the component. If the relay is defective, the component won't operate properly. Relays are located in the fuse block and the Power Distribution Center. If a faulty relay is suspected, it can be removed and tested by a dealer service department or other qualified repair shop. Defective relays are not serviceable and must be replaced as a unit.

In the fuel injection system of the vehicle, horns, starter and fog lamps, relays are used to convey electrical signal to components using a low current control circuit to regulate a high current power circuit. A faulty relay will result in the improper functioning of the linked component; most of the commonly used ones can be found in the engine hood fuse/relay container while the exotic ones are beside the interior fuse box at the dashboard. If a faulty relay is suspected it can be removed and tested using the following procedure or can have to be taken to a dealer service department or any authorized repair shop and the relays have to be replaced as a set if they are faulty. Most relays in these automobiles are ISO relays which have terminal numbers which show the connections in the circuit and functions of each terminal, there are two general terminal arrangements. Other terminals of the relay control circuit are connected with the relay power circuit so that the coil can develop a magnetic field tend to close the larger contact to supply power. Thus, most commonly, terminals 85 and 86 are the control circuit; however, certain connections are necessary in case of diode or resistor. Terminal 30 has connection with the battery voltage supply of the car, and terminal 87 has connection with the ground side. One method of testing the relay is to use the ohmmeter in order to check continuity through the control coil, and greater or lesser resistance values should be shown in each direction, if however, infinity is indicted the relay should be replaced. Continuity should now be tested between the power circuit terminals like before but with out continuity between terminal 30 and 87 when the circuit is de-energized. By using further another fused jumper wire to terminal 86 positive battery terminal and the other end of a fused jumper wire as ground at terminal 85 the relay should click, and continuity is last checked between terminals 30 and 87 should be checked. There are certain tests which reveal that the relay has not worked and in such a case it is replaced.

By connecting jumper wires to the appropriate terminals and the battery, the relay should click, indicating it is functioning, and continuity should be present between terminals 30 and 87.

The relays commonly used are ISO relays, which have numbered terminals indicating their circuit connections and functions, with two basic terminal layouts.

Defective relays must be replaced as a unit.