I was going to mention that. Apparently newer Chrysler (and many other brand) vehicles have started introducing circuitry that shuts down amp channels if it sees no load. It can cause many odd issues, like no output, or a pop when it turns on, sees there's no load and shuts back off, etc. Something to do with the new Class D amps they're using.
Audiocontrol also makes a piece called the AC-LGD that shows the amp a load.
https://www.crutchfield.com/S-9qrWiS...ol-AC-LGD.html
We just had a Scat Pak 392 Charger in the other day and used an Audio Control LC6i (cust owned from previous car) to combine signal to try and get a full range signal. It worked miserably. We even swapped in an LC8i and it wouldn't combine signal either. Had to combine the front doors and rear deck to get a full range signal, but whenever we introduced the dash speakers into the mix, it went sideways. Glad to see you got yours figured out.
A friend works for Alpine and knows a guy who worked on the audio systems in those cars. When he asked where to get a good signal in that car, the guy just laughed.
Jay