I will try to put a basic how-to together when I have the time; I'll have to scan the schematic I drew up and get together a part list. Be forewarned, though, that some electrical experience is needed. Basic soldering, and knowledge on how to use a multimeter is required; I'll put it out there but I can't commit to getting too involved with trying to troubleshoot problems over the internet for miswired lighting.
Also be forewarned that you will likely have to pull the bumper skin to install the wiring and the valance as per the valance installation instructions (rather than the "small hands" cheater installation. lol). This will be to route the wires properly through a few tight places that you'll have a hard time getting to with the grille one.
When I did the install, I didn't cut any factory harnesses; I bought 2 pigtails and scavanged the other 4 from the pigtails that came with the California Special valance. If you do the same you'll be able to unhook your wiring and reconnect the stock grille lights while you sort out any problems you have.
"We are all born ignorant, but one must work hard to remain stupid." ~Benjamin Franklin
2012 Kona Blue Mustang GT
Roush Phase 2 625HP Supercharger | Black OTT Stripe | 400A | 5.0L | 6MT | 3.55 | HID | SP | CP | BBP | EP | RVC
Mods: Forget it .... too much to list!