Big Kahuna

Here is a question specific to Tobago owners and just too weird for general consumption:

I have recently rewired the electrical cabinet, so I have become a little more aware of the old girl's wiring.

While getting ready to lay her up for the summer in Grenada, the Admiral opened up the storage under the nav station seat to clean it out. In there is a wiring box to which I had never before paid much attention. I opened it up this time to find a great bunch of red wires bunched together, and a great bunch of black wires bunched together. They read a potential across them equal to the battery voltage. I thought I knew all the wires on the boat, but these bundles are strangers all, and I cannot even imagine how they are energized! As we had no time to investigate before leaving for the summer, they await investigation.

Have you come across anything like that?