Re: Replacing Volume Pot With a Kill Switch
Well, the volume pot is a resistor linked to ground in parallel to the signal going to the jack. Your signal doesn't go through the 500k part. At the volume of 10, it is nominally 0 K in the path to the output and 500k to ground. As the path of least resistance is to the jack, you get signal. Some signal will go to ground even on 10 - which tends to be the highest of the highs. Only infinite resistance to ground (open circuit) will lead to no signal traveling through to ground. This is the same as having a no-load pot, or wiring straight to the jack.
As you roll the volume down, you simultaneously reduce the resistance to ground and increase resistance to output. So the only time the pickup has 500K in front of it is at volume 0....but there is a direct path to ground.
500k in series may well just reduce the output of the pickup.