[gmc67swb]

We have dual filament bulbs in our trucks.(integrated brake lights) The socket is the ground. The left side has a Yellow(left turn) and Brown wire. The right side has Green(right turn) and Brown. The Brown wire is the tail lights. The reverse lights are light green. If you just switched the wires that operate your turn signals, your turn signals would both come on when you hit your brakes. I think you may need a turn signal switch that has seperate turn/brake lights.(non-integrated). I'm sure someone on here could figure out a way.

Try this site:http://www.geocities.com/chevroletc1070/taillghts.html