This is something people rarely check. So I ask people to check and replicate. thanks.
I found that on my radiant charger, earth is much inferior than my own body or some gallon of water.
Test was done by connecting the negative or the positive side of radiant charger output to ground. The power source MUST BE battery.
For illustration for how insignifant the earth ground compare to human body, with analog volt meter, my radiant charger produce 75V without connected to anything (open). 80V when the output negative connected to the ground. 150V when the output negative connected to my own body.
I got the same phenomena when repeating the experiment with other radiant charger circuit, with digital voltmeter and with few gallons of water. The water do not connect the earth.
Here is an example during charging I believe. Since stingo do not normally produce 12V. The load should be a broken battery. But this still show that touching the output can increase output power. Anyway, try it on your circuit.