It's always a bad sign that I don't even know which is the right forum for this on my own site.
My KxK's bridge pickup started picking up some serious hum. I tried a different cable, and since I have the option, a whole different rig, and it's still there - crazy, super loud hum. It only does it with this guitar, and the hum is there in the neck position as well, only quite a bit less.
I popped the back open and started poking things with my hand (to basically use myself as a ground) and it didn't make a difference, so I don't think it's a solder connection. The guitar's brand new, everything looks super clean, and all of the connections are rock solid.
What else can I try to determine what's causing it?