Thank you 340six, Cab_Burge, ruderunner and crackedback for reading the entire post and answering or giving input related to the question. I appreciate it more than you guys know. I figured the system Cab described was what I needed but didn't want to presume it.

Cab_Burge do I need to run a wire from the switch all the way back or will just tapping the light wires serve as the trigger? Just ensuring I'm correct that I will only use 3 of the pins on each relay for this project.

Crackedback was it you that built or builds the headlight isolation harnesses? If so is it needed if I'm running LED headlights?