Deciphering wire harness under helm for wash down pump

[lostpacket]

I want to put a wash down pump and ideally I can control it via one of the available switches but there are so many wires and it's unclear how to route wires that now I'm confused. There is an existing switch "live well" that's not in use but down work and is hooked up to power. I tried tracing the wire coming out of the switch but it goes into a bundle and I have no idea where it comes out. Is there some way Bennington has set this up to make it easy to use these connections? Is there a better way to fish a wire, basically I want the pump in the back where the battery is.

 

[lostpacket]

So I found the wire (brown/orange) but it just disappears with the bundle under the boat..any idea where this comes out or where to look for this?