Re: BC Rich Mockingbird MK 5 pickup wiring?
The easiest way to figure this out would be to look in the control cavity of one of those guitars, but I wasn't able to find any pics online. According to specs I could find, they're OEM BC Rich pickups so the color codes may not be published. Based on the available specs for the guitar, we can make some educated guesses about what the wires are. The Mockingbird Mk. 5 has coil splits, so the red, white, and green wires are probably an output, ground, and coil split (similar to the red-white pair on Seymour Duncans).
If you have a multimeter, measure the resistance between each pair (red-white, red-green, green-white). I would expect one of those pairs to have double the resistance of the other two, that will be your full humbucking output and ground. If you're not going to use the coil split, tape off the third wire so that it doesn't accidentally ground against something inside the cavity. By connecting the full humbucking pair of wires and the plain ground wire, the pickup should at least work and if you're using a pair of them you *shouldn't* need to worry about them being out of phase with each other.