Trailers are fun. i had a short in mine and i would turn on the right blinker and bam all the lights would blink. Its either a short or a ground problem easy fix, if all else fails go to walmart and buy a wiering kit for 30 and some new lights everything together is like 50$ or so for all new lights. Also unplug the lights befor you back into the water if not they will pop.
ya they might im just trying to help. But i get the walmart/napa bulbs and if you back into water with them pop. So i unplug and they work fine. The marine shop was trying to sell me 40$ a light for some fancy Marin light BS ill just unplug.