I installed a switch on mine so I could turn them on when camping. Just enough light to light walk around and not bother any neighbors. Not to mention if it was pitch black out and I took the dogs for a walk I could see the trailer on the way back!
And before I did the switch, I used a 15A blade fuse with the blades bent just a bit and slid this into the connector. The running light circuit and battery circuit are right next to each other. Very easy to make the lights come on. And if you have an old school flasher you can plug that into it and make the lights flash. Good if your broke down on the side of the road and need to leave the trailer.....and perfect to upset the neighbors!!!!