It sounds like something is still hooked up incorrectly, since you have the ignition switch disconnected and the 15-amp circuit breakers are still getting power to them somehow.

You'll have to do as Ripsaw suggested---get a wiring diagram, start at the + terminal of the battery, and verify the wires go to where they should go, and there are no extra wires installed that shouldn't be there.
.
.

 

Ok, follow the trail Is there pwr after the breaker?
Keep going.
I think there are two wires to the Post side of that battery, If so are both hooked up?