Have been battling weak headlights in a 2001 Olds Aurora for a while now. I've tried Philips Xtreme Vision/Power bulbs and now on to HIR bulbs to replace the stock 9006. The HIR's were a VAST improvement but I feel like they are beginning to yellow out more and more. Car has weak grounding, particularly from the passenger side bulb but when I attempted to wire in an extra ground wire I found it would short out the turn signal fuse. Same effect when I wired in a relay harness. I can post the schematics, and I may have in the past but I would love to hear from somebody a little more knowledgeable than myself for options to upgrade the grounding, and maybe voltage supply, to these bulbs