Overall view of the second stage
adapter, taken from approximately Pos. IV (LOX tank 4 and fuel tank 4 are
at center on the bottom; note the GOX line
running up F4's left side).
Picture 1 of 2.
This picture is exposed for the external portions of the stage.
The wire running up from F4 to the second stage adapter is presumably the
stage's lightning rod grounding wire.