OK - I went ahead ans switched the wires and that did the trick - however - there is now one other issue. I have a grounding hum which gets aggravated if I brush my fingers on the pickguard or touch the neck pickup cover. The squier pup had three wires with a separate wire soldered to a pup cover lug that went separately to ground, while the 64 pup has two wires with a jumper wire going from the pup cover to the negative (black) wire where it is soldered to the pup eyelet. Having reversed the wiring, do I need to switch that jumper to the white wire - or should I just run the separate (third) wire from the cover to ground as it was originally?