Looking at Vortec's pics it seems to be reversed from how I have it hooked up as well. On mine the cables red stripe is located on the right hand side towards the rear of the ATV. I can tell it is correct as the Syba board gets power and shows disk activity for a bit then the ATV will reboot. Every once in a while it will work long enough to get it to the recovery prompt but then it just drops connection again after the reboot. I don't have anything to test the voltage unfortunately, so my troubleshooting for now is limited to verifying everything is connected properly. I may see if I can purchase a similar cable from another vendor if I am not able to make any progress.
I appreciate all your help!
I tried turning the cable around and it didn't make a difference. The pins pass straight through regardless of the orientation, and the device powers up which means it's plugged in correctly.
These are the exact symptoms I was having as well, where it would restart endlessly and made it to the recovery menu a couple rare occasions. I've tried different cables (same model and vendor though) different bridges different everything and it doesn't change a thing. If you make any progress let me know, I'm sure it would fix mine too.