I received an order from L-Com today with a bunch of additional connectors, shells, etc. I installed the female DB-37 onto the annunciator control board. After installing this, I hooked up a couple of annunciator lights and the dimmer and verified I could trigger the lights on both high and low signals as well as verified that accidentally grounding the high trigger or putting +12V on the low trigger had no effect. Everything tested out perfectly.
I also installed some longer jack screws in the connector.
I soldered the other side of the jack screws to the circuit board to provide some additional support to the connector. This thing is very strong now.
I also installed jack screws in the avionics interconnect circuit and soldered them to the board. These circuits are ready to install.
