Dual Battery with Isolator Wiring Question for 1000 Owners

Hey guys. I’ve read a lot of threads on here about the dual battery option. I actually had this on my 900XP a while back using the Quadboss isolator with the additional battery. When I went up to the 1000XP I noticed the extra capacity large battery and elected not to do the same setup. I have just purchased the 2016 1000XP and after reading these recent posts, have considered going back to the dual battery with isolator configuration. I run the SSV overhead stereo, LED light bar, CB radio and whip sticks. These are the extras I planned on running to the 2nd battery.

My question is, there only seems to be one cable running to the current battery both + and -. With everything wired into these single cables running to the battery, how do you isolate the leads from the stater to route through your isolator? For those running a battery isolator, how did you run the wiring to your isolator? I ask because on my previous 900XP, these were separate wires. On the 1000XP, they are all tied in to one wire going to the battery.