Disconnecting H bucker to Single coil (HH to HS)

I have a SR5 HH. And now I wanne disconnecting one wire on the selector switch so that the pickup (closest to the bridge) is out of running. So I should have a kind of HS.
Should I solder the place where the (black) wire was on the selector to the ‘earth’?
Or will I have ‘earth’ problems?
Any Idea?