newbie question - do I sand down the neck joint to fit?

ok checked ground wires, earth wire to bridge remarkably different. checked connections etc now when I tap the bridge PU i get the echo tap thru the amp which I didnt get before. BUt still no sound from bridge PU when solely selected.

Used ultimeter got readings from neck PU but nothing from bridge PU

:)

Okie dokie - all checked, hum reduced and now i get the faintest sound from bridge PU when selected but volume on Amp has to be turned up to 3/4.

Bridge PU is much stronger now, noise hum changes depending where Im facing amp etc :)

SorrY I meant neck PU is a lot stronger now :) Getting there.....process of elimination I guess