Exaclty, so how do you control the controller.
I think you have it in your head that you have to switch the positive side of the valve to control it, you don't have too.
You connect the positive side of the valve directly to positive supply, then control the controller that switches negative side of the valve to gnd.
Can you post a picture of the valve and controller please?
Can you please tell us your electronics, programming, Arduino, hardware experience?
I wired up the power directly to the valve I'm controlling, and passed the ground through the relay (this is how the valve is setup in its original form, with a driver pulsing the ground.
I don't understand why this is so complicated. I just need a DC relay that operates faster than a mechanical one. I tried searching before but every single post was full of people who wanted to make this so insanely complicated that a clear answer was never given.
In my original post I said I'm feeding power directly to the valve and having the ground pulsed.
I AM NOT IN ANY WAY GOING TO EVER USE ANY PART OF THE ORIGINAL CONTROLLER WITH THE VALVES. PLEASE UNDERSTAND THAT I AM TRYING TO SIMPLY PULSE A VALVE WITH AN ARDUINO. PLEASE STOP ASKING ABOUT THE ORIGINAL CONTROLLER.
The original controller is $25,000 unit designed to control MANY MANY input/outputs at once. The valve I'm trying to control is a small part of the equation. I want ZERO affiliation with the original controller in any way.
The valve is an industrial cooling valve. No part numbers. No data sheets. No manufacturer stamp. Its a 14 ohm coil that operates under 12v in most circumstances.