Is there an easy way to tell what wire colors do what on our cars? I have the 04 coupe service manual, but they aren't descriptive enough. I'm specifically trying to figure out what wire does what on the rear tail lights. I can test them myself with a multimeter and try and figure it out, it'd just be nice to know for sure before I start messing with things.

 

Hey, so nobody knows anything about this? I found in the service manual that it's connected B125 of the Body Harness No. 2, but I can't seem to find a layout for that anywhere. Anybody with the service manual want to help me out? I'm looking in the electrical wiring part and the lighting part. These service manuals are pretty confusing.