The ornamental design for an exterior surface configuration of a truck headlight, as shown and described.
FIG. 1 is a perspective view of an exterior surface configuration of a truck headlight showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a top view thereof; and,
FIG. 5 is a reduced perspective view thereof.
The design envisioned contains a second portion whose image is mirror symmetrical to the one shown. The embodiment shown is for the left side of the truck. The broken line showing denotes environment and is not part of the claimed design.