help wireing a perko switch 4 second batt.

I have a perko switch selecting what battery i want to use. my problem is on the preko switch under it i cant fit every wire that needs to be hot.I want to be able to have the light on my tower be able to be use on any battery.Do they make some thing to turn the four extra wires into one to go to the perko switch.I have wire form stater going there as well. plesase help