I want to hook up my trailer lighting and have tried long enough and need assistance. Simple question: what wires do I tap into just to get the tail lights to light up? My trailer has the usual brown, white, yellow and green wires. White is for ground and brown should be for the tail light. The other two are for turn signal. I've tried all sorts of combinations through the passenger tail light and cannot get the lights to power up. The same trailer works fine on my Jeep. Don't tell me to use the Jeep. Any constructive help would be appreciated or if I could actually have a wiring schematic that seems to elude me in my Google searches. Thanks.