Adding a HHO booster system

I am sure you are familiar with an hydrogen booster system where two diodes are mounted atop a container filled with distilled water with baking soda, each diode with plates (all SS) not touching so that when a direct current is placed on one diode and the other grounded, the current passing through the solution dissociates the H20 into H, H, O which when vented through the top of the container via a one way valve and introduced into the air intake does burn along with the gasoline in the system. this causes the computer to reduce the gas flow, thus saving fuel. The burning hydrogen and oxygen also cleans carbon from the system.

It works great, but my problem is this:
I do not yet understand how to regulate the amperage (I think) because I keep melting the #14 wiring insulation . I tapped into the high beam wiring to utilized the existing switch and used another relay between the tap and the HHO system.

I am thinking that I need to use an empty fuse slot for power and incorporate a dedicated switch and relay, but I am not sure how to hook it all up or exactly how the amperage could be regulated and therefore regulate the temperature. Obviously shooting in the dark here. I think I want to draw about 3 amps to run the HHO system.

Any direction about how to size it and wire it?
Your advice would be greatly appreciated.

Sincerely, Jim Sloan