@Phaedrux Okay, looks like the ribbon cable may have been "part" of the issue. I noticed that the tops of the connectors on the ribbon cables did not seem seated fully. I removed the ribbon cable, re-seated the top piece, and re-inserted the ribbon cable. I am now receiving 5v on the duex.
The BL-Touch is still not working properly. It runs the self test on bootup and passes, stays lit red, but will not deploy/retract, or trigger. I'm using the default modix files, but I think it may be best if I start a new topic on this issue.