Need help with HRAP EX - Drawing too much power

Hi guys,
I’ve got a HRAP EX that I’m trying to fix, and it’s not looking good.

I thought that it might be a simple case of a loose safety connector, so I cut it, twisted the appropriate-coloured wires together & used heatshrink to wrap it all up.

Now however, when I plug it into my Macbook Pro, it keeps saying it’s “drawing too much power”, and disconnects the USB port.

Has anyone got any tips on what I can do to fix this stick? :crybaby:

Another thing I was just thinking of - is the jacket of the USB cable “ground”?

(by “jacket” I mean the foil covering the red/white/green/black wires)