Starter Fuse Blown Symptoms: How To Test It & Fix It

Unlocking the mysteries of your vehicle’s electrical system can be daunting, but understanding key components like the starter relay fuse is a great place to begin. This vital piece of your car’s ignition system bridges the gap between the ignition key and the starter motor, ensuring your engine fires up smoothly each time you turn the key.

A faulty relay fuse could result in a no-start condition or other car troubles. In this blog post, we will dive deeper into the workings of the starter relay fuse, its importance, and common issues that can arise.

What Does a Starter Relay Do?

The starter relay, also known as the starter solenoid, acts as an electrical switch for the starter motor in your vehicle. The relay receives a small electric current from the ignition switch when you turn the key, activating an electromagnet inside the relay. This magnet closes a set of internal contacts, sending a much larger current to the starter motor.

The high current from the car battery, too large to be safely carried through the ignition switch, is thus effectively controlled. This process is crucial in starting the vehicle’s engine. Without the starter relay, the starter motor wouldn’t receive enough power to turn the engine over, and the vehicle would not start.

What Causes the Starter Relay to Become Faulty?

Hand turning car key in the key hole to start the car engine.

Like all components in a vehicle, the starter relay can degrade over time due to general wear and tear. Frequent starts, poor maintenance, or poor-quality relays can speed up this process.

Heat and vibration can also damage the relay, as can electrical issues like short circuits or overloads. Corrosion or loose connections can impede the flow of electricity, preventing the relay from working correctly.

How to Test for Starter Relay Issues

Testing for starter relay issues typically involves a few steps. The first is a visual inspection for signs of physical damage, corrosion, or loose connections. The second step is using a multimeter to test for electrical continuity. With the relay removed, you can check the resistance across the coil’s terminals; a high resistance reading could indicate a faulty relay.

The next step is to check for voltage at the relay’s power input; if there’s no voltage when the key is turned, the problem could lie elsewhere in the ignition system.

How Do I Know If My Starter Relay Fuse Is Blown?

A blown starter relay fuse often presents itself when the vehicle fails to start. The engine may not crank at all, or there may be a clicking sound when you turn the key. You can also check the fuse visually; a blown fuse often has a broken or melted wire visible inside it.

Pliers holding a broken or blown fuse from vehicle fuse box.

Alternatively, you can use a multimeter to check for continuity across the fuse; a blown fuse will not show continuity.

What Happens When Starter Relay Fuse Blows?

When the starter relay fuse blows, the electrical connection between the ignition and the starter motor is broken. As a result, the starter motor won’t receive the power it needs to start the engine when you turn the key. The vehicle will be unable to start until the blown fuse is replaced.

In some cases, a blown fuse could indicate a problem elsewhere in the electrical system, such as a short circuit or an overloaded component that’s drawing too much current. If a new fuse blows soon after replacement, it’s likely there’s an underlying issue that needs to be addressed.

Where Is The Starter Relay Fuse Located?

The location of the starter relay fuse can vary depending on the make and model of the vehicle. However, it’s typically located in one of the fuse boxes. Most vehicles have two fuse boxes: one under the hood (also known as the power distribution center) and one inside the cabin. The starter relay fuse is most commonly found in the box under the hood.

To find the exact location of the fuse, you can consult your vehicle’s owner’s manual or look for a diagram on the fuse box cover. The diagram should indicate the location and rating of each fuse and relay. If you’re unable to locate the fuse or if you’re unsure, it’s best to consult with a professional mechanic or your vehicle’s manufacturer.

Signs That Your Starter Relay is Damaged

1.     Intermittent Issues Starting Your Vehicle

One of the most common signs of a faulty starter relay is intermittent starting. This means that the car may start fine one moment and then fail to start the next. This irregularity is often due to the electrical contacts within the relay becoming worn or pitted, resulting in an inconsistent connection.

2.     No Sound When Starting the Car

If the starter relay is damaged, you might not hear anything when you turn the ignition key. This silence can be a clear indication that the relay isn’t supplying power to the starter motor as it should.

3.     Clicking Sound When Turning the Key

Conversely, if you hear a clicking sound when you try to start your car, but the engine doesn’t turn over, the starter relay could be at fault. This clicking sound is made by the relay attempting to close its internal electrical contacts, but failing to pass enough current to the starter motor.

Woman starting car.

4.     Starter Stays On After Engine Started

If the starter motor continues running after the engine has started and the key is released from the start position, it could indicate a starter relay that’s stuck in the “on” position. This can result in serious damage to the starter motor, the relay itself, and the vehicle’s battery.

5.     Vehicle Starts Without Key

Although a rare symptom, if your vehicle’s engine starts without the key in the ignition, it’s a sign of a severely damaged relay that’s stuck in the “on” position, supplying constant power to the starter motor.

How to Fix or Replace Your Starter Relay

1.     Identify the Faulty Relay

Before replacing the relay, it’s crucial to correctly identify the faulty part. Check your vehicle’s manual to find the exact location of the starter relay in the fuse box.

2.     Disconnect the Battery

For safety, always disconnect the vehicle’s battery before making repairs. This prevents accidental electrical shocks and unintended starting of the engine.

3.     Remove the Faulty Relay

Once you’ve located the faulty relay, remove it from the fuse box. Most relays can simply be pulled out, but others may be bolted in place and require a socket or wrench for removal.

4.     Install the New Relay

After removing the old relay, install the new one. Make sure it’s the correct type for your vehicle and that it’s properly seated in the fuse box. This usually means it’s firmly plugged into the appropriate socket.

5.     Reconnect the Battery and Test

Once the new relay is installed, reconnect the vehicle’s battery. Try starting the vehicle to confirm the new relay is working properly. If the car still doesn’t start, there might be another issue that needs to be addressed, and it’s best to consult a professional mechanic.

How Long Does A Starter Relay Typically Last?

Starter relays are designed to last the life of the vehicle under normal conditions, but factors like frequent starts, poor maintenance, and poor-quality parts can shorten this lifespan. It’s not uncommon for a relay to fail after 80,000 to 100,000 miles, but some may last significantly longer or fail sooner. Regular servicing and proper care can help ensure the relay’s longevity.

Can I Drive With A Faulty Starter Relay?

No, you cannot. If the starter relay is faulty, the vehicle may fail to start or may have intermittent starting issues. This could leave you stranded or cause you to lose power unexpectedly, creating a potentially dangerous situation. If you suspect a faulty relay, it’s best to have it replaced immediately.

Is Replacing A Starter Relay Expensive?

The cost of replacing a starter relay is usually relatively low, with the part itself typically costing around $20-$50 as of my last update in 2021. However, labor costs can vary depending on your location and the specific make and model of your vehicle.

Can A Starter Relay Affect The Battery?

Auto mechanic checking car battery.

Yes, a faulty starter relay can affect the battery. If the relay is stuck in the “on” position, it could cause the starter motor to run continuously, draining the battery. Similarly, if the relay is not making proper contact, it could cause the starter motor to draw more power than usual, again draining the battery.

Can A Starter Relay Cause A Car To Stall?

While it’s rare, a faulty starter relay can cause a car to stall if it is stuck in the “on” position and the starter motor is drawing significant power from the battery while the vehicle is running. This could lead to a decrease in the power available for other vehicle functions, potentially causing the car to stall.

Can A Bad Starter Relay Drain My Battery?

Yes, a bad starter relay can potentially drain your battery. If the relay is stuck in the “on” position, it could cause the starter motor to run continuously, which can quickly drain the battery.

Can You Bypass A Starter Relay?

While it’s technically possible to bypass a starter relay, it’s not recommended for safety and practical reasons. The relay is designed to handle the high current required by the starter motor, which could otherwise damage the ignition switch or other components. Bypassing the relay could lead to electrical shorts, fires, or other dangerous situations.

Can A Starter Relay Fuse Be Repaired?

Starter relay fuses are generally not repairable and need to be replaced if they are blown. Attempting to repair a blown fuse can be dangerous and could potentially cause further damage to your vehicle’s electrical system.

How Often Should I Replace My Starter Relay Fuse?

There is no set replacement interval for the starter relay fuse. It should last the life of the vehicle under normal circumstances. However, if you’re frequently blowing this fuse, there may be an underlying issue with your vehicle’s electrical system that needs to be addressed.

Can A Bad Starter Relay Cause A Check Engine Light?

While a bad starter relay itself might not trigger the check engine light, the problems it causes, like a vehicle failing to start, could trigger the light. If the check engine light is on, it’s best to have your vehicle inspected by a professional to determine the exact cause.


Understanding the function of the starter relay fuse, the signs of its potential failure, and the steps for testing and replacement is crucial in maintaining your vehicle’s health. While it may seem like a small component, the starter relay plays a critical role in your vehicle’s ability to start.

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About Brock Rangel

Hi, I am Brock, and I am the lead editor/photographer for TheCarColony. I have been a mechanic for over 14 years now, and I am here to spread my car knowledge across the web!