How to Troubleshoot a New Brake Light Switch Not Working

When it comes to vehicle safety, brake lights are essential components that warn other drivers of potential hazards. A brake light switch is a component of the braking system that activates the brake lights when the brakes are applied. If you have recently installed a new brake switch and find that it is not working, it can be very worrisome. Fortunately, there are a few steps you can take to troubleshoot the issue and diagnose the problem.

Testing the Line Voltage of the Brake Light Switch

The first step in troubleshooting a newly-installed brake switch is to test the line voltage. When the brakes are applied, the switch should provide 12 volts of impedance for the brake light circuit to activate. To check the voltage, use a multimeter and attach the leads to the switch terminals. If the voltage reading is not 12 volts, the brake switch is not providing the necessary power to operate the brake lights properly.

Checking for Ground Issues

Another common cause of a brake light switch not working after installation is a ground issue. If the battery ground is torn, frayed, or the connection is weak, the switch will not receive the power it needs to function properly. To check the ground connection, inspect the battery terminals and cables to ensure they are clean and securely connected. If the ground appears to be okay, remove the wire going from the brake light switch to the ground and use a multimeter to check the voltage. If the voltage is not 0 volts, the ground connection is faulty and needs to be replaced.

Inspect Wiring Harness Connections

If the line voltage and ground check out okay, the next step is to inspect the wiring harness connections leading to the brake switch. Look for any signs of damage, corrosion, or fraying wires, which can cause the brake light switch to fail. If the wiring harness looks okay, then disconnect it from the brake switch and use a multimeter to check the continuity of the wires. If the wires are not providing proper continuity, then the wiring harness needs to be replaced.

Replacing Corroded Terminals and Sockets

In some cases, corroded terminals or faulty sockets can be the cause of a new brake switch not working properly. To test this, remove the brake light switch and inspect the terminals and terminals sockets for any signs of corrosion. If the terminals and sockets appear to be corroded, then they will need to be replaced with new ones. If the terminals and sockets appear to be in good condition, then reapply the brake switch, test the line voltage and ground, and inspect the wiring harness for any issues.

Wrap Up

If your newly-installed brake light switch is not working, do not panic. By following these steps, you can troubleshoot the issue and identify the underlying problem. If all else fails, it is recommended to take your vehicle to a trusted auto repair shop for further inspection and diagnosis.

How To Replace Your Brake Light Switch Yourmechanic Advice