My brake lights stay on and my tag lights not working

The brake light on the top of my cab stays on all the time. Why Thank You Tom

So that relay is part of the brake lighting system so I got replacement and that fixed it Thanks

The right hand trailer brake light always has power to it.
Tested 7 pin receptacle on truck and everything works as advertised other than the right hand signal and brake pin which has 12 volts always, even with key in the off position. With right hand blinker on you get off/on 12 volts as you should. Brake lights on truck work fine.

Thanks, that was the culprit.

Truck has daylight running lights but my brake lights stay on all the time only when I step on the pedal the lights brake lights go off, oh and the 4 way flashers work when ignition key is off but when I turn the ignition key on they stop working because brake lights are on all the time but when I step on the brake peddle the brake lights go off and then the 4 way hazard lights flash also. Any help will be greatly appreciated as it is my wife's pickup and she uses it to drive our handicapped son to school and I want to keep them safe

replaced the switch but before I put the new switch in I checked the brake lights and it was still on put the new one is and they were still on. Found the DRL fuse removed that thinking it could have been a cross in the wires, Traced the wires back and unplugged the wires going back to the tail lights( brake lights) and the lights went out. Now the silverado has the full package ie multifunction control ie directional cruise control and wiper controls and high and low beam control. I did pull the brake light fuse and the lights still stayed on. Then pulled the brake light relay under the hood and the brake lights went off. Put in a new relay and the brake lights came back on. Somewhere there is power going to the backlight relay under the hood but when the ignition key is off there is no power going to it.

Any ideas? Thanks Dash142

Thank you for this post I replace the turn signal switch and the system started working cost me $76.00 for the part.

All 3 of my brake lights are stuck on.I replaced the break switch it didn't work, there even on when its disconnected.I tried disconnecting the headlight/dimmer switch and each brake light one at a time, they still stay on. The only time they go off is if I remove the relay under the hood.I tried a new relay but they were still on. When I remove the relay they tailgate lights go out but the 3rd light on the cab stays on.I tried unplugging the 3rd brake light and the back 2 were still stuck on.I have a remote star but I disconnected it and it didn't help but the brake wire its connected to has +12v's it should be -12v's. Its like there is a bad relay somewhere thats stuck but I can't find any others. HELP !

Multifunction switch? Could ya be more specific? Theres no "multifunction" switch in the book. And maybe where its located? Like under the hood? Under the dash?

Hey your multifunction switch is the lever that works your turn signals, wipers, washer, and cruise control. Hope this helps.

When I step on the brake pedal the brake lights stay on except for the high third brake light goes out. When I tap the pedal a few times they usually go out. It does not happen every single time but more than not. I changed the brake switch and the tail light circut boards. I am getting very fustrated because I need the truck and cannot drive it like that. Please, if you have any ideas let me know as soon as possible. Thank you, Will

Even after a new brake light switch same problem