my Ford F-150 brake lights stay on when the truck is off, what to check?

Solution

1. Preparation

• Gather necessary tools and ensure safety by wearing gloves and goggles.
• Disconnect the negative battery terminal using a socket wrench to prevent electrical shock.

2. Inspect the Brake Light Switch

• Locate the brake light switch mounted on the brake pedal assembly.
• Disconnect the electrical connector from the switch.
• Check the switch for physical damage or corrosion.
• If necessary, remove the switch using the appropriate tools (usually a socket or wrench).

3. Test the Brake Light Switch

• Using a multimeter, set it to continuity mode.
• Test the switch by pressing the pedal; continuity should be present when the pedal is depressed.
• If the switch does not show continuity, replace it with a new one.

4. Inspect the Brake Light Relay

• Locate the fuse box and find the brake light relay.
• Remove the relay and inspect for any signs of damage or melted plastic.
• Test the relay with a multimeter or replace it with a known working relay.

5. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Turn on the vehicle and test the brake lights by pressing the pedal to ensure they function correctly.
• Ensure the brake lights turn off when the pedal is released.