Airstream classic 2006 Owner's Manual page 71

ELECTRICAL
12-VOLT EXTERIOR
7-Way Harness and Plug
The diagram above match the tow vehicles plug.
The 7-way wire is spliced to the main harness on
the interior front wall of the trailer. The connection
is accessed behind the front sofa in the front of the
trailer or by removing front cabinet drawers on slide
out models. One of these wires is not spliced onto a
wire of the same color. It is the back up wire that is
yellow in the cable and black in the harness.
G
G - 4