I have tried using the same phase for all channels and using two separate phases for channels 1-4 and 5-8. Neither seem to work. It's like channels 5-8 are somehow blocked/protected electrically.

Make sure they are the same phase for 1-4 and 5-8 on same 2x8 module.

So I'm having an issue with two (2) GLXX-2DIM8 units where on both of them the channels/relays 5 through 8 are not outputting 120vac when they are turned on. 1 through 4 work perfectly though (through