This is the same poster and the same narrative already posted here:
http://www.gm-trucks.com/forums/topic/152762-hid-headlight-bulbs-hid-projector-retrofit/page-31?do=findComment&comment=1489354
I think I identified what caused my truck to fail starting. I bought a Range V8 and installed it last week. I drove the truck once, and then it stayed parked for 5 days. Then the truck wouldn't start. I remembered the Range V8 and went to their web site to contact them and ask if the unit could cause a battery drain. I found this information on the site:
So I can testify that this is absolutely correct.