The thermocouple should be in the flame.
If you have a pilot light, it should be in that flame. Although, is sounds like you don't have a pilot light.
It might look like a skinny pencil with a wire attached. The wire goes to a gas control valve. When it gets hot, the thermocouple generates a small voltage, and that voltage causes the gas control valve to open and flow gas.
Alaska to Key West, Labrador and more
Prostate cancer survivor. See Thread Prostate cancer and Sportsmobiles
2015 VW GTI 2020 Fiat 124 Spider
2012 E250 Hitop camper