planning to put an LED light strip under the crossbar that the seat backs rest against. In my case, all the cabin lights run through the GAD27 via 3 rotary dimmer pots that I bought prewired from Stein. So, I ran wiring from the appropriate aux connector in my wiring diagram and tested the strip via panel mount dimmer switch.

Didn't work. What the heck?

I got out a meter and definitely had power to the rotary switches, and continuity all the way to the GAD27.

Later, in an introspective moment, I realized that every time I have a problem with something like this my default position is to think that there's something wrong with the wiring or hardware because thats what I've been comfortable with my whole life. I automatically reach for a meter or whatever. Now that I'm running everything through an interface,I'm going to have to unlearn that habit. It seems like more often than not, it's just a setting defaulted the wrong way or something.

Went into config mode on the PFD and sure enough, there's a tab for cabin lights and a setting to turn on the 3 channels for the rotary dimmers, as well as select which switch you want to control which output, if you want the brightness to be linear or pop on all at once etc.

All good....But I'm a technological dinosaur.