I have been a volunteer firefighter since moving tot his rural area in 94 and joining the local dept and in this "hobby" I have seen lots of strange stuff thusly when we started renovating a house built in 1855 and wired in the 40s all the cloth wrapped wire came out (6 circuits in 3000' house) with lights on cords suspended from ceiling.
I ran most of the wiring and I have two sets of wire nuts in the entire house where I could not avoid it. Both are air suspended, both are pre twisted and soldered prior to wire nut application and both are taped with +/- facing opposite directions, nuts taped tight and to the line. 12 ga everywhere except overhead lights.
I have been in the attics of houses in the middle of the night where the junction boxes with wire nuts have started arcing and luckily woke the folks up. Looking at them I could tell they were not pre twisted prior to wire nut application, just held parallel and let the nut do the twisting.
Then there are those that were not woke up in time to kill the power and fires started. Looking at those boxes they were done similar. I have never seen a junction box with a proper pre twist of wires before the nuts were applied.
That brings us up to current events. On our 76 Sovereign
the front overhead never worked and I finally got around to checking it out and headed off a disaster in the making. I was changing lights out from "issue" lights and replaced them with 18 LED chip lights with 1156 bases and lights would still not work and I figured out the rotary switch and gone South and to my chagrin little wire nuts were all through the fixture.
I determined the hot wire and proceeded to bypass the switch to touch it to circuit and unscrewed a wire nut holding about five wires and under the whole bundle was all corroded green.
I decided right there life was too short to get another rotary switch so I decided to install a 120V single pole commercial switch with a shallow plastic rough box but first I needed to rewire the entire light with a known good wire and properly soldered connections. I cut a length of 12Ga THHN and adjacent to each light I stripped the hot wire, wrapped it around exposed 12 Ga and soldered/taped them properly. The end of the hot wire was put on one screw and the incoming hot wire on the other and all the lights now work very nicely with one switch (rated at 120V) mounted onto ceiling and the effect of the LEDs is there appears to be florescent lights there.
I have been laying in a goodly amount of LED lights, modules, panels, 5 meter strips etc upwards of 10 Watts draw and all these lights come with 22 GA Wire for up to 300 5050 or 5630 LED chips per light! ! ! !
Thusly I am going to use existing 12V wiring in the overhead and the new circuits I will add will be wired to a 7A Astron power supply with junction strips. I will mount it securely where it will plug into box in microwave opening. I found some 22 Ga wire I have a partial spool of that has four conductors so I can run two circuits off each terminal. Stuff is called call #357 and rated at 300V AC and it is heavier than the wires that come on the LEDs.
LEDs are bright so you need to kind of figure how to use them in indirect lighting or with a cover to kill the glare making them into soft lighting. The LEDs listed as warm white give the same color as incandescent bulbs.
I learned a trick from Mennonite Tarp guys in Ohio on trip there in 2012. They use 1"X4" wide strips of vinyl covered fiberglass tarp material as wire hangers so wires on trailers are always just held softly and not tied down where vibration works on insulation. They double the ends back over and use one self tapping metal screw to secure the "stirrup" and run the wires through them. They generate barrels of scrap pieces and any tarp shop would probably give you scraps to make your own hangers. Thusly I have these hangers on my utility trailers as well and inside the bed cover on my pick up.
I am going to run white modules down the outside of the AS and use the door overhead light switch/housing as the power source for the outdoor lights.
Most amazing is a 12 volt
wall bracket light I found on ebay. $10.00 delivered, 550 lumens, waterproof outdoor housing, 10 watts and is wired with the fine wire. It can be aimed and secured where you want it. I hooked one up to power supply and knew right then one of these is going on back of trailer as a back up light running a wire from a existing back up down to it.
I too am a avid fan of soldering everything and taping with UL tape as well.
The stop,run and back up lights will also be changed to 18 chip 1156 base LEDs which will most like drop 80% of the load from the AS issue circuits.