So I just got some switchback LED turn signals and the load resistors for them, and the instructions say to connect the resistors to the "ground and blinker hot leads"... but I don't have my multimeter or test light at home and I have no idea which of the 4 wires are which. It's probably safe to assume that the black wire is the ground but I can't just guess which is the blinker hot. If anyone knows for sure let me know, thanks!!

 

On the front signals there are four wires, as you said. One is the ground (black), two are parking lights (brown), and the one that's left is the signal. I don't know why there are two browns, you'll have to ask GM that one. If I remember right the signals are blue ones, might be different shades of blue depending on what side of the car you're on.

 

Awesome, thanks. Just hooked them up and they work perfectly. I knew you where the right man for the job.

 

pic or vid of the switchbacks

 

Here are a few pics from last night, before I had the resistors in, I'll do a video when it gets dark out.

 

http://video.cardomain.com/VideoPlayer.aspx?id=706564

Link to a short video.