Potential Start Relay Wiring Diagram

By | September 15, 2023

Potential Start Relay Wiring Diagram

The potential start relay (PSR) is a critical component of the starting system of many gasoline engines. It is responsible for sending a signal to the starter motor to engage, which starts the engine. The PSR is typically located in the engine compartment, near the starter motor. The PSR is a simple electromechanical device that consists of a coil, armature, and contact points. When the ignition switch is turned to the "start" position, the coil is energized, which creates a magnetic field. This magnetic field attracts the armature, which closes the contact points and sends a signal to the starter motor. Once the engine starts, the PSR is de-energized and the contact points open, disengaging the starter motor. The PSR is a relatively simple device, but it is essential for the proper operation of the starting system. If the PSR fails, the starter motor will not be able to engage and the engine will not start. ### Potential Start Relay Wiring Diagram The following diagram shows the typical wiring for a potential start relay: In this diagram, the ignition switch is connected to the PSR coil. When the ignition switch is turned to the "start" position, the coil is energized and the contact points close. This closes the circuit between the battery and the starter motor, which causes the starter motor to engage. Once the engine starts, the PSR is de-energized and the contact points open. This opens the circuit between the battery and the starter motor, which disengages the starter motor. ### Potential Start Relay Testing The PSR can be tested using a multimeter. To test the PSR, follow these steps: 1. Turn off the ignition switch. 2. Disconnect the PSR connector from the vehicle. 3. Set the multimeter to the "ohms" setting. 4. Connect the positive lead of the multimeter to the PSR terminal labeled "S". 5. Connect the negative lead of the multimeter to the PSR terminal labeled "E". 6. If the multimeter reads "0 ohms", the PSR is good. If the multimeter reads "OL" (open circuit), the PSR is bad and needs to be replaced. ### Potential Start Relay Replacement Replacing a PSR is a relatively simple procedure. To replace the PSR, follow these steps: 1. Disconnect the negative battery cable. 2. Locate the PSR in the engine compartment. 3. Disconnect the PSR connector from the vehicle. 4. Remove the PSR mounting bolts. 5. Remove the PSR from the vehicle. 6. Install the new PSR. 7. Connect the PSR connector to the vehicle. 8. Connect the negative battery cable. Once the PSR is replaced, start the engine and verify that the starter motor is working properly. ### Conclusion The potential start relay is a critical component of the starting system of many gasoline engines. It is a simple electromechanical device, but it is essential for the proper operation of the starting system. If the PSR fails, the starter motor will not be able to engage and the engine will not start. If you suspect that your PSR is bad, it is important to have it tested and replaced as soon as possible. By following the steps in this article, you can easily test and replace your PSR yourself.


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