I think I might have fried one of my motor controllers when I plugged my battery into it (the 48-72V 1500w one). I am aware in the image the power + and - are backward but I connected them correctly. There was a big spark when I touched the positive leads and it never made my motor turn when using the throttle with all of my wires connected correctly. I have a new controller and was looking for advice to ensure I don’t fry a second one (VEVOR). Safety of my setup aside is there anything I am missing or a way to prevent welding my fuses to my wires when I connect them? I attached images of my setup. Big thank you to anyone who tries to help in advance!