If you’re lucky enough to have a radio shack near you all you need is a diode. Costs $1.50 for 2. If not, then this is what you need https://boostautoparts.com/products/1999-2020-gm-auto-fogs-mod?variant=13954734751799 This activates then with the parking lights. They specifically state to not use the headlight wire for this mod though I don’t know why. Sent from my iPhone using Tapatalk Pro