Unfortunately, we can't amend it for the first 4000 units as the harnesses have already been made.

The easiest way to fix it would be power/ground wires coming out of your box/the cable used between your box and the empeg: I know it's not ideal, but the amount it would cost to split the harnesses, get new moulded cables, and re-do it all is well into 5 figures :(

Hugo