I am adding a light to the outside of my horse trailer to illuminate the area where the horses are tied. The tie rings are on one side of the trailer, and I'd like light there for times when I'm at shows after rides that run into the evening.
I have the light,already mounted, and have found an always live (whenever the trailer is plugged into the truck) wire that I've been able to splice into near the light. Now I want to add a switch. I want the switch inside the trailer in the front tack room, mounted on the wall, and rather than running wires to and from the switch to the light, I'd like it to be a wireless switch.
The 12V DC wireless switches I've found for use in cars and trailers all operate with key fobs, and that isn't what I really want. I want a fixed wall switch.
I have used a wireless switch for a 1120V barn light that I like, but the instructions say that it requires a neutral wire be present. I'm assuming this neutral wire requirement is only for a 110V system, and I plan to use the switch for a 12V system.
Since a 12V DC light only has a single power wire, plus a ground wire connected to the trailer metal, can I just treat the neutral wire in the switch relay as a second ground wire, and connect neutral and ground wires both to the trailer frame? Or just ignore the relay neutral wire?