How To Troubleshoot Brake Lights. If you are still having problems a. Unplug the brake-light switch and if the lights stay on a short circuit is the case.
The switch can be checked by pressing on the brake pedal. Insert the new bulb by inserting it into the area and turning it clockwise until it is securely in. You can test the brake light switch with a test light.
The break light switch connects and completes the brake light circuit in a car.
Start your engine but keep it in Park with the parking brake on. However the tester must fit the tow vehicle socket. Brake lights will not come on. They arent engaging well enough or they arent disengaging.
