I have a 2022 Prius LE. I want to add an LED light which would come on when the DRL/headlight is turned on. Otherwise it should remain off. (for discussion let's ignore the new light's amps/watts). Do you have ideas of how to do this? I am able to tap into the DRL and headlight wiring to get power for the new light when they are turned on, but I'm pretty sure wiring the DRL and headlights together to the new light will cause "bad things to happen." I read somewhere about the idea of using a relay so only one source can connect power to the new light. I like the concept but I have no experience or knowledge of automotive relays. Any suggestions appreciated.
Update I can't figure out how to turn the light on "automatically" via relays. My dashboard has no empty places for a switch. I will repurpose the otherwise-unused HUD button on the multi-function switch. That goes to an MGI fused relay connected to switched power to turn the light on/off. If I ever figure out an "automatic" approach I can disconnect the switch & change the relays.
