Hot diggity dog! What a complete article! This is the sort of detail that needs to be available to every project. Huge thanks to Tim! Guess that I will set my headlamps up with relays before I plug them in. Opinion time: Do you suggest putting relays in for the backup lights? Do I want to run full voltage/amperage through my transmission's Neutral Safety Switch? And for DRL circuit - same thing? The headlamps I am looking at have a DRL "angel eye" function that lights up when the key is in RUN position. Even though this is an LED function, I am pondering a relay here, too.