Help identifying wires, please

JRRNeiklot wrote:
I have 3 white wires coming from the junction box under my camper. They transition into a black wire that ends in a ring terminal. I have no idea where this wire goes. I don't know if it's a ground or positive, if it's trailer brakes, or what. The previous owner has apparently engaged in some redneck engineering. I'm including a link to a picture, since I can't figure out how to post a pic. If anyone can help identify these wires, I'd greatly appreciate it.

Thanks.

https://imgur.com/3ZHLsBp

Try to rephrase your description. You say 3 white wires coming from a J box. What is coming in and out of this j box? What are they hooked to in this J box? Are all three and the black wire hooked to a ring terminal? Where is this ring terminal? If black and white, black is positive. If black and red, Red is positive. Are we talking 120 volts or 12 volts. Is this romex wiring or single strand wire? Not enought info.