I brought my new 2004 Sierra home today, and I'm having problems with the tail lights. The story I got was it was a project that two brothers in Florida tried turning into a show truck, but ran outta money after getting 3/4 of the way done with it and sold it. It has custom LED tail lights like the ones shown in the link, but they're at the top of the tail gate. They work as parking lights and running lights, but do not flash for braking and/or turn signals. I need to find replacements for these, and tips as far as repairing a possible electrical problem. HELP PLEASE.http://s1328.photobucket.com/user/Jimmydean771/media/image_zpscc015f70.jpg.html?sort=3&o=0
check the tail lamp bulb, some bulb are dual and have two wire inside, if one brakes the other one still works. that could cause the light to turn off when you press the brakes.