I searched the forum and got what appears to be references to wiring of some older model Casitas. I have a late 2013 (titled 2014) 17' SD.
What I am trying to do is install a single high mount stop/tail light in the space between the top of the spare and the window. I saw that others had installed similar lights but could not understand which wire(s) to tap with ScotchBlok connectors.
In the interest of clarity, I will describe what I found in excruciating detail. Please bear with me. I know how to do low voltage wiring, once I identify my power source(s) and ground.
I unscrewed the angled wood cover panel underneath the rear dining table and after clipping several nylon cable ties, was able to uncover what appears to be six 12 volt wires. One group of four consists of red, green, white, and yellow wires. This group was doubled over and appears to turn back toward the driver side bench seat. A group of two low voltage wires, one green and one white, continue laterally and disappear under the passenger side bench seat.
There are also two yellow romex type 110 volt wires and a black corrugated wire loom cover which "might" contain the specific wires I am looking for. And of course the red, white, and blue water lines from the pump/fresh water tank/water heater..
Please take a look at the attached picture and, if you can, identify which wire is which. I am not going to make any assumptions. You folks are the veterans-I am just a rookie.