help taillights are screwed

my taillights on my gmc sonoma wont work when i start the truck but when the truck is off i have brake lights and turn signals?WTF is the problem? Any help would be great thanks

you got the ground hooked up in the rear?

myfullsize had the same symptoms, we forgot the ground in the rear after we bagged it. Sounds like your problem as well.

if its not the ground in the rear its a ground under ur dash next to the door. i couldnt have a cd player cause when i had my lights on it would pull the voltage down so fare it would die. then a guy that owned a Garage come and fixed it for me in 2 seconds. the its a 10 mm screw and its next to the door under the dash on teh driver side. hope that that helps man

I found it, the ground wire was broke in too. I fixed it, thanks for the help.