You will probably need a relay with normally open, and normally closed contacts, so with one switch you can switch between the 2 circuits. Might be able to even do it just operating the relay and normally open contacts when the headlights are on, and with the headlights off the daytime lights could be set up to be on with the ignition switch, and normally closed relay contacts. Just try to find the best option on paper.

Last edited by 4100 Fire Truck; 07/14/2018 2:55 PM.