Originally Posted By: eljefino
If your tow vehicle has seperate amber bulbs for the turn signals, there's a small diode box that takes "Brake (all), Left, right" and converts it to "Solid brake on the (non-blinking side) with (other) blinker on" at the trailer. I've seen corrollas with seperate amber turn signals, is why I ask.
Anyway that box might require a certain current pass-through to work, which LEDs are not demanding. Or it sucks "a little" current to work, which LEDs can't do without. Sort of like trying to run a motion sensor light with compact flourescent bulbs, the bleed-thru isn't right.
All I know is when I installed the lighting kit, it worked perfectly, and then about once every month or two I would experience one or both tail lights on the trailer either not working at all, or being lit very dimly. Usually, cleaning the grounding surfaces gets them back to working properly, but I did that this morning and it didn't fix it this time...it appears this time I have a bad harness, either on the trailer side or on the car side because it isn't a grounding problem. I just don't understand why these lights are so finicky...the lights on vehicles don't do this, why do trailer lights do it?