Thanks for the link to the manual. That is going to be really helpful when I work on my car.
I decided not to add light flash to my car (head lights), but I have a couple more questions about the ignition harness wires.
First of all, I am assuming the thicker (looks to be 16 gauge) red wire should be the ignition wire? There is also a red thinner wire, but it is around 20 gauge.
Also, in the source posted here:
zerothread?id=261082 , there are two accessory wires. Does the first or second accessory wire power only the headunit?