Zenith radio filament question

[Randall]

Yet another issue. I have never like power switches in the neutral side, so I want to move it to the positive side, no trouble there. Except that I measure 141vac on the input side of the switch when open, and the other side of the switch goes to ground! Nothing on the AC input wire that goes to the filament string and power supply. But when switched on, it's 0v on the switch and 131vac on the filament string and PS. What gives? Did I get my iso leads reversed? And why does it look like I am switching mains voltage to chassis, is this a function of having an iso chassis?

[Jazz P Bass]

With the ISO transformer there is not any real zero volts now is there?

[Randall]

I'm the one asking the questions here Jazz P Bass.