I rewired my HSS strat today, popping in a P90 sized single (thanks Tom!). But the switch clicks. When changing positions while playing there is an audible click, which wasn't their before. I swapped over to a tele style 3 way switch (which is awesome! $% the 2 and 4!) and it's still there.
Also swapped over a pot, which works fine (the previous pot was wonky when turning up to 10).
As usual, everything is earthed properly and wired up to the Fender approved diagrams. Help.