Lost power to HWH Leveling Jack Control Board 200 series

Thanks for your replies all. I have some direction now.

Just for clarification, on the backside of the control board face is a 5 amp tube fuse. That is the wire which I tested for conductivity to the orphan wire in my opening post.

I will test an open slot on the fuse block for 12 volts when ignition is on. When I find that, how do I connect the male spade? Do I need a fuse with a female tap? Or is there a way to secure the spade with the fuse?

Thanks.