I tested the voltage but not the amperage on the 5V 10A supply, because I assumed the amperage was ample due to the leads sparking when connected. The voltage is ~ 5V.
What should I expect across the InX terminal of the Relay and the Ground of the Arduino? I'll check voltage, amperage, continuity etc when I get home.
I'm truly lost lol.
Thanks for the time and input my friend.