67 Dart Conv. - No Tail Lights, Park Lights, Flashers

Mopar_Parr said
The weird part is that the courtesy lights stay on when the door is closed and dim them the brake is applied.

Mopar_Parr said
I will check this and report back, yes I measured on the supply side. L8 powers M1(Left front door automatic switch) the door switch and back to the D terminal throught M2? What would cause L8 to loose power when shutting the door? Thanks again for the help on all this.

These really point to something related to the courtesy/dome light circuit shorting or backfeeding.
That's why I want to study that a little more and hopefully we can narrow down where to look.

How did you disconnect the horn so it wasn't blowing constantly?