If you wired it up as specified by BKP (red = hot, black = ground, white and green together and to ground for split) then the slug coil is active. Want to have the screw coil active - solder black and red together and use green and white as hot resp. ground.
Cheers Stephan
I did not originally wire it, just wired it the same way when I changed the pickup. Almost embarrassing :) I wanted it primarily so that I could get that middle+bridge tone to have two possibilities. I rarely use the split tail bucker alone, but now that I (re)discovered it, I probably will.
On my PRS I don't really use the split bridge humbucker alone that much, but sometimes. I think on the McCarty the split position drops the slug coil, so that also contributes to the tone. EDIT: screw coil is dropped and slug coil is in use, in both the strat and the PRS.
On my LP I don't even have it on the bridge, just on the neck. That's where I use it a lot more :P
-Zaned