Brake lights stuck on

[EggsBenedict]

My 2003 Expedition Eddie Bauer has brake lights that are stuck on. I have to disconnect battery when not in use to avoid draining the battery. So far I've replaced the switch connected to the brake pedal and disconnected the light switch on the dash and I continue to have brake lights on. I'm down to thinking it's a short or something in the wiring but if anyone has encountered this and has another possible fix I'd be very appreciative of any help.

 

[99WhiteC5Coupe]

My 2003 Expedition Eddie Bauer has brake lights that are stuck on. I have to disconnect battery when not in use to avoid draining the battery. So far I've replaced the switch connected to the brake pedal and disconnected the light switch on the dash and I continue to have brake lights on. I'm down to thinking it's a short or something in the wiring but if anyone has encountered this and has another possible fix I'd be very appreciative of any help.

Did you use an OEM Motorcraft switch, and did you calibrate / adjust the new switch after installation (and before use)?

 

[EggsBenedict]

I used a compatible aftermarket switch. I'm not sure how to calibrate/adjust the switch.

 

[EggsBenedict]

This is my brake light switch

 

[JChan]

I am new to the forum but I couldn't resist this one. This sounds like a classic short to ground. The wire is exposed and touching ground someplace after the load/bulbs. The rear lights probably share the same ground so it affects both sides. Remove the tail light assemblies and check wires near the connector for anything obvious especially anywhere the wire could be rubbing against metal. It's a good place to start and costs nothing.

 

[Yupster Dog]

I am new to the forum but I couldn't resist this one. This sounds like a classic short to ground. The wire is exposed and touching ground someplace after the load/bulbs. The rear lights probably share the same ground so it affects both sides. Remove the tail light assemblies and check wires near the connector for anything obvious especially anywhere the wire could be rubbing against metal. It's a good place to start and costs nothing.

We just had a member post about this couple months ago.

 

[99WhiteC5Coupe]

I used a compatible aftermarket switch. I'm not sure how to calibrate/adjust the switch.

Install the new switch. Grab the brake pedal and pull it rearward, then push it forward until it stops (engine off). You may hear clicking. This calibrates the new switch for your brake pedal travel.