[Here In Oregon]

I have two Grace 101 preamps that I want to use in my studio and wanted to
know if somebody could tell me how to wire these units. I have custom built
Canare star quad balanced cables coming from the Grace units and I am
hooking it up to a Mogami 2932 snake feeding the Apogee AD-16X. I am
getting 60 hertz ground cycle hum from both Grace 101 units. All of my
other 14 preamps flowing through this snake are dead quiet but they are
hooked up differently.

The Canare cables are wired: Neutrik Female XLR to Male XLR
Two whites to pin # 2
Two blues to pin # 3
Shield to pin #3

The Mogami snake 2932 cables are wired: Neutrik Female XRL to a DB-25 multi
pin connector
The different colored wires in the snake go to pin # 2
The drain/ground wire goes to pin # 3
The black wire is not connected. Pin #1 is empty

I have an idea of what is wrong but I wanted to get opinions from those who
have done a lot of wiring and soldering.
My back muscles are killing me as I have been soldering for a couple of days
now and I hope I am saying this right and pardon my stupidity.