The trailer I just bought has very nice, very large wooden taillights, all working. The left hand light (please see photo) has a clear lens to shine light down on plate below it, but no bracket in place and also, if I rig something up, 1. it's gonna stick out like crazy and I know I'll catch on it every time I walk by 2. it'll catch the wind at 60mph and seems like that'll be noisy and will probably stress that tailight over time. So, I'd like to place it on or below the rear bumper. The parts I have researched tend to have a black and white wire. One is ground, of course, and I imagine the other ought to tap into the running lights, which on a 4 wire harness is brown. Hope I am making sense so far. Might seem like a very basic question but that's why I'm here: where and how should I tap into the brown wire? Should I splice to the existing brown wire end point at one of the taillights? Is that the best approach - my question really is - is that unsafe and should I be thinking about this differently? Appreciate any feedback because for the moment, I'm not road legal though its still cold here.