I installed a new Curt hitch 11396 last Friday night. That went pretty smooth, on my 2015 S Leaf. I spent part of Saturday morning installing the wiring kit 956227. Got it all from eTrailer. The wiring kit seems to be flaky. I have a new folding trailer from Harbor Freight with LED lights. I tested the lights pretty exetensively last week with a 12V source. They appear to work very well. Even measured the current for each line (Green, Yellow, and Brown). Each was pretty low drain.
So I finally hooked up the Curt interface to the trailer and initially I got turn signal response, but no running lights. Brakes were ok. Then I disconnected and reconnected. That second time I lost the turn signals and got running lights. So I did the reseating of the connector a third time and had everything but the running lights.
I disconnected everything and loaded the kayak up on the trailer to do a quick test run around the neighborhood and when I connected to the trailer again, I had running lights on all the time (whether the headlights were on or off), no right turn signal, and not sure about the brakes. I tried to cycle and reseat the connector a few times but made no difference. I finally disconnected the trailer and used the volt meter on the Curt connector. Voltages were consistant with what I was seeing on the trailer.
So did I get a defective interface? The connections must be good because all signals work properly on the car's lights, so that feed-thru cables are definitely connected correctly. I guess this is what I get for installing all the cover panels back in place.
ETA: I sent an email to eTrailer about the problem and they said they were going to contact Curt about it. I guess I'm waiting to hear something back, but just wanted to see if anybody else had experienced a similar problem and could shed some light on the whole deal.