So, I have a 2012 F-150 XLT SuperCrew. I have mounted 4 lights, one below each door to illuminate the running boards and ground below. I have each side (2 lights) wired to a relay that's appropriately grounded and has a 12v source. What I'm missing and having problems with is finding the correct wire to use as a trigger wire to have these new lights operate with the interior courtesy lights. I've read several articles and forums and have gotten multiple answers as to which color wire to tie into and a location of that wire. If anyone can clarify which wire I need and where to find it, that would be great! Please and thanks!