I had 2 issues with my Retro HIDs that have been fixed by them no problem. My 2000 Excursion and my 02 F250 have the same HID kits. I kept losing a bulb on my 250 every few weeks. Ended up being a ballast,not a bulb. Long story short, if you have your light switch to auto, if your switch has it, keep it on off till your truck is started. I found it odd the my 250 was pooping lights and my Ex wasnt. When i would start my truck at night, the lights would come on automatically before the truck was running. Start the truck, and I had only one bulb working. Did some thinking and between the glow plugs, and the starter, battery voltage was dropping below what the ballasts needed and locking out the ballast. Just some food for thought.