Too late tonight to run to the basement and take a pic, but there are dozens of people complaining about it I am finding... Google thunder x 3 male PSU
Anyway, it appears the quick fix is to hook up directly to the chassis of the PSU from the miner. I imagine I can do this with two of the below, which I have on hand, but I have to open it up and then take the LEPA 1200 gold I was going to use for this and switch it out with my two black widows' corsair rm 750s.
Don't suppose you could help confirm if that would work, or if I should be wary of any polarity issues?
http://www.corsair.com/se-fi/rm-series-rm750-80-plus-gold-certified-power-supply