I need some ideas. My 2009 Ford F150 pickup uses the same wire for daytime running lights (DRL) and "full" headlights. The stock setup was halogen bulbs with full brightness receiving 12 V and the DRL receiving 7 V. Now I have HID headlights wired through a relay. The relay closes at 7 volts so the headlights are on full power during the day.
I plan to convert to LEDs for the DRLs hooked up to a 12 V. I just need to drop the 7 V on the main headlight wire so the HIDs are not on at all during day. I'm looking for advice on how to do this.