I have a newly installed AVIC-6000NEX.
The installer used T-Tap connectors.
It is causing problems with my trailer lighting.
When I turn the unit on, the head unit lighting is normal.
When I pull the light switch on, the head unit dims, whether the vehicle is running, or not.
This is also making my tail lights on my trailers intermittent.
Sometimes the lights will work and sometimes, not.
Brake and turn signals are working OK, just an issue with the tail lights, on 2 different trailers that have been in service and work on other trucks.