Hi Phantom044
I would agree with your if the issue was not persisting when swapping the D7 and D4 lights around, but the problem is following the lights, not the output. In other words, if the ezCAN had an issue with dimming on the output of the D4s (for example, white output), and the D7s were working as expected on the red output. If the issue was localised to the white output, moving the D4s to red would allow them to dim correctly. As you mentioned though, the D7s work as expected and when moving the D4s to their output, they still don't dim, i.e. the issue persists on different outputs, meaning that the issue is with the lights and not the ezCAN.
I suspect it's most likely the switch wire, rather than the light itself. Can you configure the output to which the D4s are connected as a 2-wire output and check whether they are now able to dim? i.e. disable 3-wire dimming in the software. If they can dim, that means it the switch wire coming from the lights/the connector pigtail to which the D4s are connected.
Kind regards
Ruan