Well I hooked them up to a battery, they work fine. Every trailer I have has a ground connected from the plug to the tongue on the trailer somewhere along with a ground on every light. Or atleast the the two main tail lights. I guess I thought since it was aluminum with no paint, it would have grounded just fine and the two grounds for each tail light would have sufficed. I guess i'll polish the aluminum where the ground is and hook up the ground to the tongue. It's not all a waste though, Imo it needed to be done anyways, so might as well have fresh wiring with good water tight heat shrink butt connectors. I have two other trailers with led lights on them and haven't had to mess with them for 3 or 4 years now since I put them on. I guess I've gotten rusty. lol I need to remember the KISS method. No need buy a new house just cause the toilet isn't working and that's pretty much what I did.