I can't believe someone drilled a hole to plug the extension cord, it would've been more or less the same amount of effort to do it properly. I'm sure it was very satisfying for you to clean all that mess.

Thanks for your video, find this interesting, maybe I should try this, a boat project.

Oh my God, glad you are pulling that rats nest of wires out of the boat. I'm not sure how the previous owner didn't fry himself or the boat. Keep up the videos, great progress is being made.

You should be able to lift the slider panel up, pull the bottom out, then slide the panel down and out.

That capacitor attached to the outlet is to prevent large voltage drops when a significant load is placed on the circuit. Never seen it done that way but hey, never seen extension cord wiring either.

Strip the coating off the wires especially the big stuff with a razor blade and a pair of pliers and then recycle the copper. It brings good money that you can use for boat projects.

The outlet that has a capacitor and not sure what the orange thing is, but it could be a larger capacitor, or inductor. The PO may needed to use the capacitors to filter the power as that is what those capacitors are probably doing. Maybe the PO noticed some odd interference on the power line. In any event, its a Frankenstein and you should chuck it! I'll bet the PO was using that plug for DC power rather than AC from the inverter. Most devices these days have their own electrical filtering.

When do you plan to go in a marina or on yard? You kinda need this...

Vasil, have you inspected your through hull fittings? Given the state of the wiring and the dodgy way the wires were connected/set up I would want to look carefully at any connection to any hole in your boat, especially those under the water line.

The coil of large yellow wire is shore power cord for when at dock. It always amazes me how butchered wiring can become. Tear it out and do it right.

All the wiring in your boat needs to be cut out and removed. Definitely needs to be put on the hard where you can dismantle everything. Fix and patch all holes and paint it. Followed by redoing all systems on board to suit your needs.

Here's a link to Pacific Yacht Systems series of Marine Electrical tutorials: kzfaq.info/get/bejne/h8CTmcKY1ciqlmg.html

Don't toss that yellow "extension cord " that's a shore power cable for use in a marina. They cost well north of $100 depend on length & amp rating maybe $250

Sorry man but those inverters are going to kill any power saving by using 110 ac LEDs, inverters consume a ton of power "converting" the power. you really need to get your 12v system up and get 12v LEDs. just to throw it out there, I spent 20 years as a Navy electrician, I'm in SD and have a sail boat as well in Fiddlers cove marina just south of you. I love seeing old boats brought back to life.