I am getting ready to do this but whats the verdict on the correct wiring?I just did this today, and I have a few comments.
I found everything at radioshack. I used a 20w 8 ohm resistor. I searched for days and couldn't find a kit. Every auto parts store thought I was crazy hahaha. They acted like I was looking for a bag of wizardry.
So I wired my everything to your diagram, and I discovered that you have your wired crossed. The solid green wire is supposed to go to the green/silver wire, and the red wire is supposed to the green/yellow wire. everything else was correct.
Has no one else tried this?