[seanwitte]

I would order a few male and female battery connectors from IFI. Cut two red wires and join them at one end. Do the same with the black. The ends you joined together will go into a female connector that will mate to the battery. One of the free pairs gets a male connector and plugs into the rc, the other goes into the terminal block on the ESC.

Now you have power going to the ESC so you need just the signal. The ESC will be powered from the battery. If you cannot disable the BEC on the ESC then the best thing to do would be to get a servo extension and disconnect the red lead. The rc only needs to supply signal and ground, not sure how it would react to the BEC input.