Wiring up the signal wires to the factory stereo.

The green plug in the stereo is the power and speaker outputs. For those of you that need it:

Left Front: + Blue /- Brown and Blue

Right Front: + Yellow /- Yellow and Black

Left Rear: + Green / - Green and Black

Right Rear: + White / - Blue

I used crimp connectors and electrical tape. Would have soldered the connections, but there was very little slack in the wires to work with.