It sounds like the main fuse is blown. As I understand it, the jack is separately wired through a separate fuse, so the fact that it works tends to confirm that the batteries themselves are OK and properly charged.
Who installed the dual batteries and the marine switch? I assume it was not you, but was it someone knowledgable on 12-volt vehicle electric systems?
Take a look at your batteries. The + terminals of the two batteries should be connected together, and then a wire (red or black) from one of them leads off to the TM or, in your case, to the switch. Somewhere in the first foot of this wire there should be a fuseholder. Assuming it hasn't been replaced, the fuseholder is a white nylon cylinder about 2 inches long and half an inch in diameter. It comes apart in two pieces, and the fuse (a glass cylinder) is inside.
Take a look for this, and let us know what you find.
By the way, if you find the white nylon fuseholder, is either end kinda brown?
There may be (should be) another wire from one of the + battery terminals and going directly to the jack.
The brake light is probably a separate issue, though as Brulaz says, it sounds like something is mis-installed or mangled or loose or shorting. Let's deal with the basic problem first.
Bill
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