Vood - hope that you see this

I just replaced my CV 50's Squier Tele neck pickup with a Fender '64 neck pickup. I had previously added a 4-way switch for the 'both pups in series' mod, which always worked fine, with that position being louder than the others. Now I have the following situation:

position 4 - both pups in series is thin (no bass) and lower volume, with 60 cycle hum
position 3 - neck pickup sounds great, no hum, normal volume
position 2 - both pickups, thin (no bass) and lower volume, with 60 cycle hum
position 1 - bridge pickup, sounds great, no hum, normal volume

I am suspecting that maybe the 64 pickup is rwrp? Can I just reverse the wiring on that pup to get back to a working configuration?

Thanks!