Ok, so what you can do is, for example, go up to the red port light, and short it out with some clip leads wire. Then go back to the electric box and find the shorted pair.
or.. you can use something called a wire tracer, also wire sniffer, also fox and hound. There are several names people call this but it is the same thing.
Amazing deals on this Cable Tracker at Harbor Freight. Quality tools & low prices.
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Instead of a short circuit, this will put a signal on the one end with the small piece, then you walk to the electric box and use the larger one to sniff or smell out the wires with signal. For this to work, all wires must be unconnected from anything. If they are connected, the signals will go everywhere and you will confuse the sniffer.
As far as where the wires are.... from my memory as I am not near my albin vega now.
Everything on the mast on my boat travels above and behind the sofas. Then travel inside the mast arch and up the mast.
The bathroom wires travel along the starboard above and behind the couch.
The pulpit lights go inside the deck I think. I think they exit the electric box at the back and up.
Things that are at the rear 0f the boat exit the electric box a the back bottom starboard side. THey travel in the starboard side under the cockpit floor.
You can run new wires for everything if you want except the inside the deck wires.... well, you can probably, if you want, run those along the boat port or starboard side above and behind the sofas.
I hope this helps. Let me know if you want more info. Im not sure if you are rewiring everything or just reconnecting.
groundhog