The wire colors are different for different pickups. The "hot" wire goes to the switch. I think with the stock pickups that's white, but with Entwhistles it's black.
The black wire goes to the switch. The green wire should go to ground (earth). The white and red should be soldered together. They are just there so that you can install a coil tap or series parallel or phase switch. But they come soldered together from the factory for series humbucking.
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