GM 13503102 Relay Asm,Multiuse *Gray

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A relay can be tested by removing it and checking for continuity using an ohmmeter.

Most relays used in vehicles adhere to the "ISO" relay type standards, with numbered terminals indicating their usual circuit connections and functions.

If the ohmmeter registers infinite resistance in both directions, it indicates that the relay should be replaced.

If a relay is defective, the corresponding component will not function properly.

Several electrical accessories in a vehicle rely on relays to transmit electrical signals to their respective components.

If a relay contains a diode or resistor, specific polarity and resistance values should be observed.

Several electrical accessories in a vehicle, such as the fuel injection system, horns, starter, and fog lamps, use relays to transmit the electrical signal to the component. Relays have a control circuit and a power circuit, with the control circuit opening and closing the power circuit. Defective relays can cause components to not operate properly. Most relays are located in the engine compartment fuse/relay box and must be replaced as a unit if they are defective. ISO relays, which follow International Standards Organization standards, are commonly used in these vehicles. The terminals on ISO relays are numbered to indicate their circuit connections and functions. The control circuit terminals are usually 85 and 86, while the power circuit terminals are 30 and 87. Terminal 86 is connected to battery positive (B+) voltage and terminal 85 is connected to ground if the relay contains a diode. 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 connected to the battery voltage source, while terminal 87 is connected to the ground side of the circuit. An ohmmeter can be used to check continuity through the relay control coil, and if there is infinite resistance in both directions, the relay should be replaced. The relay can also be tested by checking for continuity between the power circuit terminals and by using jumper wires to connect the relay to the battery. If the relay fails any of these tests, it should be replaced.

To test a relay's functionality, you can connect it to battery power and ground by using fused jumper wires on terminals 86 and 85. A properly functioning relay should produce a distinct click when the connections are established. In this configuration, continuity should exist between terminals 30 and 87. Failure in any of these tests indicates the need for relay replacement.

Several electrical accessories in a vehicle, such as the fuel injection system, horns, starter, and fog lamps, use relays to transmit the electrical signal to the component. Relays have a control circuit and a power circuit, and if a relay is defective, the corresponding component will not operate properly. Most relays are located in the engine compartment fuse/relay box, with some specialized relays found above the interior fuse box in the console. To test a relay, it can be removed and checked for continuity using an ohmmeter. The terminals of ISO relays, commonly used in these vehicles, are numbered to indicate their circuit connections and functions. Terminal 85 and 86 are typically the control circuit, with terminal 30 connected to the battery voltage source and terminal 87 connected to the component being powered. If the relay contains a diode or resistor, specific polarity and resistance values should be observed. If the relay fails any of the tests, it should be replaced.

A suspected faulty relay can be removed and tested using an ohmmeter to check continuity through the relay control coil and power circuit terminals.

If a faulty relay is suspected, it can be removed and tested by a dealer service department or a repair shop.

Terminal 30 in a relay is connected to the battery voltage source, while terminal 87 is connected to the ground side of the circuit.

If a relay fails any of the tests, it must be replaced as a unit.

These relays are typically grouped together in various locations, including the engine compartment.

Relays are used in several electrical circuits in vehicles to transmit electrical signals to components. They use a low-current control circuit to open and close a high-current power circuit. If a relay is defective, the corresponding component will not function properly. Most relays are located in the engine compartment fuse/relay box, with some specialized relays located above the interior fuse box in the dash. To test a suspected faulty relay, it can be removed and tested using an ohmmeter to check continuity through the relay control coil and power circuit terminals. The terminals of ISO relays are numbered to indicate their usual circuit connections and functions. If the relay fails any of the tests, it must be replaced as a unit.

Relays are used to transmit the electrical signal to various electrical accessories in a vehicle, such as the fuel injection system, horns, starter, and fog lamps.

If a relay fails any of the tests, it should be replaced.

If a faulty relay is suspected, it can be removed and tested by a dealer service department or a repair shop.

If a relay fails any of the tests, it must be replaced as a unit.

Most relays are located in the engine compartment fuse/relay box, with some specialized relays located above the interior fuse box in the dash.

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use part# 13503102

This relay is used for the fuel pump