I doesn’t have a Silverado zapper (yet), but have used many zappers with the 15Hz frequency.
If you moisten your skin, you should feel the characteristic 15Hz tingling, if you have any output
When you are using your zapper, - if the visual indicator (LED) is connected with the output - you should see a small flickering, resulting from the low 15Hz, you can see. Other Sylverado users should confirm this. This means the 555 oscillator is working well.
If you connect a voltmeter to the output, it will probably show around half the voltage of the battery (50% battery’s voltage, 50% almost 0V, 15 times per second))
Do not hesitate to ask the manufacturer about your problem and how to test the output
=> “I've been inspecting my stool but there's nothing unusual going on. How do I know that parasites are being killed? Are there supposed to be signs of pathogens emerging?”
The use of a zapper is a VERY personal experience, and everyone will react in a different way.
I never saw anything unusual in my stool, because there was nothing to show there (for me).
But 1st time I used-it for a big, intense sinusitis, it cleared-it in 30mn, but I was tired, with light nausea for 2 days. Something else that the sinusitis was in the way of the current too (:-)
Note: Zappers are electrical devices, acting where electricity can travel, and very little is going INSIDE you intestinal track. Result : If you exaggerate in the use of a zapper, you could have light diarrhea, among other “things”.
It has been written about zappers, for “mystified” people
Last note : I saw you sent your post to Candida Support Forum , so I suppose...
Candida many times gives serious die off, elimination problems and Candida is hard to overcome, even with a zapper. Be patient. You doesn’t have the most powerful zapper in your hands for this kind of problem.