Soldering Car Stereo Harness Wires

This is how I first wired the harness with crimp caps which isn't as good as soldering.

RR+ = purple
RR− = purple/black
LR+ = white
LR− = white/black ?
FP+ = gray
FP− = gray/black ?
FD+ ? = green
FD− ? = green/black
12V Battery = yellow
Ground = black


This is a wire before soldering with black heat shrink wrap ready to cover afterwards.


This is the wire after soldering.

After soldering all the connected wires and heat shrinking insulation: