Starter Relay

What is a Starter Relay?

The starter relay in your vehicle is typically located between the battery and the starter motor, or in the fuse box, and is used to complete the electrical circuit when activated by the ignition switch. When the ignition switch is triggered, the relay is activated and connects battery power to the starter. When the starter relay completes this circuit, the starter engages the flywheel or flexplate to turn the crankshaft and start the engine. After the engine is running and the ignition switch is returned to the "Run" position, the starter relay disconnects the circuit and allows the starter to disengage. Because the starter motor requires more current than the ignition switch can supply directly, the starter relay redirects the current to the starter solenoid which engages the starter shaft. Like all relays, the starter relay uses low-current voltage from your ignition switch to connect high-current voltage to an accessory - in this case, the starter. Because it is a mechanical part, it is possible for the starter relay to no longer make or break the connection as it should over time or if it has been damaged. If your starter relay fails to make a connection, you may not be able to start your vehicle. The starter relay may also become stuck closed, which can allow the starter to remain engaged after the engine is running, which can cause starter and flywheel or flexplate damage. O'Reilly Auto Parts has a selection of starter relays, solenoids, and complete starters for most vehicles, and can also test your starter for free on or off the vehicle to help determine the source of the problem so you can make a complete repair.