GMC 13500126 RELAY ASM,WSW MOT *BLACK

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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.

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.

There should be no continuity between terminal 30 and 87 when the relay is de-energized.

The relays used in vehicles are typically ISO relays, adhering to International Standards Organization standards.

To examine continuity through the relay control coil, follow the polarity indicated in the illustration during testing and reverse the ohmmeter leads to check continuity in the other direction. A relay with a resistor should yield consistent resistance values in both directions, while a diode should exhibit higher resistance in the forward polarity direction.

Two of the relay terminals serve as the control circuit and connect to the relay coil, while the remaining terminals function as the power circuit.

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

Most relays are located in the engine compartment fuse/relay box.

Relays are used in a vehicle's electrical system to facilitate the transmission of electrical signals, allowing low-current control circuits to open and close high-current power circuits. They help control various components like the fuel injection system, horns, starter, and fog lamps.

Most relays are located in the engine compartment fuse/relay box.

In relays with diode terminals, terminal 85 and 86 are usually the control circuit, with terminal 86 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.

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

Continuity through the relay control coil can be checked using an ohmmeter.

Relays are used in several electrical circuits in vehicles to transmit electrical signals to components.

In relays with diode terminals, terminal 85 and 86 are usually the control circuit, with terminal 86 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.

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

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

When using an ohmmeter to test the continuity of a relay's control coil, one should ensure proper polarity during testing. Resistance should remain consistent regardless of the ohmmeter leads' polarity. Infinite resistance in both directions indicates the need for relay replacement.

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