This morning, I finally made inroads to adding a new 120V outlet in my study after getting some instructions from Croft last night.
Disclaimer: I am not an electrician. All of this applies to my own rig using advice from a trusted electrician. I am not responsible if you use any information from this post and damage your RV!
Yesterday afternoon, I started on the prep. I emptied out a couple of my upper cabinets, then pried up the bottom from inside. This is smart design; instead of running wires inside the walls, a lot of my wiring, both 120V and 12V, is run inside the base of the cabinets.
As a reminder this is the outlet from which I wanted the new outlet:

As you can probably imagine, I’m tried of having that cord run across the room!
After prying up the bottom, I was able to access the existing outlet. It had a plastic casing:

Here are the instructions for opening up the casing:

That says that you have to depress all four buttons. Who designs these things?! I heard a couple of things crack as I pushed each button in and jimmied it so it would stay depressed.
The wiring was unlike anything I’d seen before:

This stumped me. I had no idea how to add the new wiring to this type of outlet. So I emailed Croft. Thankfully, he was online!
He explained that it is not possible to add another outlet from this type of outlet.ย I would therefore have to either put in a new outlet designed to power an extra one or redo the wiring for this one. Here’s a graphic I made explaining that second option to make sure that I understood Croft’s instructions (no laughing!):

Croft said that installing a new outlet was the better choice. Marrettes and electrical tape do hold, but the vibrations in an RV still make this a less stable option. Since outlets and face plates are cheap, I decided to go with the safer option.
So that’s where I was this morning. I trotted over to the home store to pick up a new outlet and, since I’m gaining more confidence in electrical matters and have other projects planned, a wire stripper and an electrical tester. I was very pleased to win 10% off my purchases when I got to the till.
The first thing I had to do today was route the new wiring. I decided that I wanted it to drop down alongside the window inside the valance so that the wiring would look neat. I had to try a number of increasingly huge drill bits before I got to one that made a big enough hole!

I plugged the drill into an extension cord running to the other outlet in the room, by the way, and once the holes were drilled, I cut the power.
Here’s the new wiring coming down from inside the valance (and a peek at the new green!):

I bought a cable raceway that will enclose the wiring and stick to the wall that is paintable. So once the wiring is done, it will be very neat and practically invisible.
Here’s the horizontal hole I had to drill between the two interior sections:

That done, it was time to strip some wires:

That wasn’t enough exposed wiring and I ended up with this:

Adding the wires to the new outlet was easy as everything is clearly labeled:

I’m not 100% sure about my wiring job, though, because of the distance one of the bare wires had to travel, so I sent a picture off to Croft and will wait for his approval before I close up the project. That said, I did turn the power back on and plug in the tester:

It’s upside down, but it’s clear that everything is good since the last two lights are lit up!

Be careful how you grab a hot outlet that isn’t mounted yet. My teeth are still rattling. ๐
I should have this project wrapped up tomorrow, after which point I will be adding a new 12V outlet! I’m now off to look at RVs with Jody and then tuck into a Gary supper. ๐