I'm trying to wire an EMG 707 into a Schecter Diamond Series 7 string.
I got the guitar with the neck pickup detached and there was no pickup toggle switch, all the wires from the EMG was wired up, from the looks of it, correctly.
The ground wire wasn't wired, so, I soldered it to the top of the volume knob.
When the guitar's plugged in, it doesn't hum, or screech.
Sound comes out, but it's extremely low output.
Even with a ton of gain.

What could be the problem?

The pots are the 500k ones that came with the EMG, and it has a new battery in it.
Go to the Ultimate Active Pickup and 18V Mod Thread, link in the Essential Links Thread.