Gee, the little woman asked me what I was holding and I told her it was the overhead display from "Blueberry", our old 98. 5 2500 CTD, and was trying to figure the electrical pin-out in order to bench test it but I didn't have the wiring diagrams for the 98 and I was sooo confused

and would have to trace the circuit card to find the power circuits. She said "You mean that big box in the bedroom closet on the top shelf?"Oo. Wow, one complete, new set of FSMs, including owner's manual and tech service bulletins. I thought the new owner got them. For the past 37+ years that woman has never ceased to amaze me.
Here is the pin-out for the overhead console plug (harness end) on a 98 (key is over pin 13):
... ... ... . Key > ^
8 9 10 11 12 13
1 2 3 4 5 6 7
For the console head unit:
^ < key
13 12 11 10 9 8
7 6 5 4 3 2 1
1. Park Lamp Driver
2. Park Lamp Output Switch
3.
4. Ambient Temp Sensor Ground
5. Ambient Temp Sensor Signal (-40*F = 336k ohms; +140*F = 2. 488k ohms)
6. Courtesy Lamp Driver
7. Fused Ign Switch - Start-Run
8.
9. Ground
10.
11. Reading Lamp Ground
12.
13. Fused B+ = Vanity/Dome/Reading Lamps
Broke out the 02 FSM and the plug and wiring are different from the 98. Looks like the 01 and 02 are the oddballs.
Now to find the dual power supply...