I went with plan B.
I figured out a way to lay on a cushion, on a bench, next to the vehicle with the door open.
Pulled the bus bar from the splice adapter.
With Key On Engine Off (KOEO), I used my voltmeter set at 12 volts and put the red lead on the power wire (brown) then sequentially tested each of the other connectors in the splice pack.
My results were:
top row
1 - Brown : .55 (grounded to the frame and red probe on the brown wire)
2 - White : .21 (red probe on brown wire, black probe on the white wire)
3 - purple : .53
4 - lt blue : .54
5 - dk green : -0.03 (this seemed like the problem child to me)
6 - Pink & Orange wires : .54
bottom row
7 - gray : .12
8 - dk blue : .27
9 - empty
10 - empty
11 - tan : .01
12 - lt green : 0.0
Popped over to the autozone site to join so I could look at wiring diagrams for a 2003 suburban.
Started at the top under the electrical items and saw this (I added the blue arrows):
I want to understand how to interpret this drawing.
Is this telling me that at the front passenger door (assuming I remove the inner panel so I can get to the wires) that I should find a dark green wire.
When I find the dark green wire, if I use my voltmeter set to 12 volts
place my black probe on the chassis frame for ground,
place my red probe on the end of the dark green wire,
KOEO,
that I should see .35 on my voltmeter?
JW