Help with Joystick connections

[ace123]

Hi,
I'm really a programming person, but I got stuck with the job of wiring our control board. I had a soldiering person help me attach the wires according to plan.

My problem is that, although the wiring seems correct and without shorts, I am getting an "Aux Fault" light on the OI when I plug it in.

Do you know all the reasons that may cause this to happen?

I will try to add a picture of the wiring between the two joysticks. I was told that I should wire them in series (ground pins 1,4 in the first joystick to power pin 12 in the second joystick. Is this how you are supposed to use them. It seems like it would not work if you simply connected the +5 Aux Power directly to both joysticks and then connected all 4 grounds back.