Ok, was all set to head down to Ky to pick up a yard tractor/mower. Reserved a 5x8 U-Haul utility trailer. Hooked up the trailer, plugged in the lights. Tested lights. Lights come on. However, no brake lights and no turn signals or 4way flashers. Switched to a different trailer and used 2 different hook ups (4 pin flat connector) between my jeep's plug and the trailer. Same thing. Noticed the trailers have LED lights but running lights work, nothing else does. So, my trip is cancelled till I figure this out. I thought my wiring harness was compatible with LED's but not sure. It's been on there for going on 5 years. I've pulled a bigger UHaul trailer before and everything was fine but that was almost 5 years ago. I pull our scout trailer which doesn't use LED lights and everything works. Sooo.. any ideas and/or do they make a device that connects between your 4 pin plug to the trailer to make it work.