Not overly difficult just choose relays rated to handle at least the amps you expect to draw for your lights of CB. Particularly for the lights you also want to make sure you have the right gauge wire. Remember you will need a heavier gauge wire based both on the number of amps being drawn as well as the length of the run.
Your amps for lights are figured by dividing the TOTAL light wattage by 12 and that will give you the amps (i.e. 100 watts/ 12volts = 8.33 amps)
Disclaimer: I'm getting old and my opinions will reflect that fact!
Last edited by highlandchef; 09-13-2011 at 02:24 PM.