2010 KW T660 visor lights stay on with key off

[Chamberpains]

More information. I spent the morning in the dark pulling fuses and relays 1 by 1 to see what circuit will kill the visor lights. Not a single one did anything. The only thing that will make them go out is to unhook the batteries. They stay out then. Once the key is turned back on though, they don't immediately come on but they do precisely when the fuel primer pump kicks on. Then they stay on.

What cab module turns on exactly when the primer pump kicks on and where is it located on the truck? Its about 2 full seconds after the key is on.

Another thing I just found was after the batteries are unhooked and visor lights go out, they work just fine by switch when the batteries are hooked back up. Heres a strange thing though, the cab overhead interior lights and the bunk alarm and clock go on and off with the cab visor switch until, once again, the key switch is turned on. Then everything energizes normally. The interior lights and bunk clock all function on their own once again. But the visor lights are stuck on then.