I have a 99 gs400 with the HID/xenons, and i would like to change to a halogen setup so that i can get aftermarket headlights. is there any adapter i can get to make this change? thanks!

 

My boss helped me a long time ago. He cut the OEM ballast wire, and I think it has 2 grounds. He then just bundled them up together. So end result was just ground and power 12+ wire. Used a 9006 harness ceramic plugs. To add to my HID aftermarket bulbs. If I remember the headlights were from ebay Massive halogen headlights brand

I'd suggest still asking if someone has a diagram of the retrofit. As for plug n play harness look on ijdmtoy.com they always have odd stuff harnesses.