you guys are going to LOVE these pictures.
i see the cable you're talking about going from the positive end of the battery to the solenoid, but THEN!, there's a regular cable goign to the starter. and when i replaced my starter, there was a thick positive cable, a thin positive cable, and a thick black cable.
this is what i'm thinking, you have the big cable supplying the power, and the thinner one telling the starter to fire, adn of course the ground wire.
as you can see, i pulled the wire "up" from the positive terminal, to the solenoid. and then you can see the wire on the right going down to the start. i'm pretty sure this is normal, and it's just the main power source for the starter.
these are the new terminals i'm going to be using. i think they may be for marine use? but they were 6 dollars, and i like the way they have the butterfly nuts on them, so if i need to add an accessory, like an amp, or for lights, it'll be extremely easy to. package said they were polarized? who knows.