Extra Blue wire

The Extra blue wire that runs from the dash to the rear of the coach teminates at this connector under the cover tail light inside cover on the drivers side. There is no connector pin in th mating connector and you will have to cut the wire out because GM no longer uses the smae pins so there are just about impossible to find. The other end is in the same kind of connector under the dash just before the harness desappears behind the side panel. Here is a link to another picture from another member.
http://www.gmcmhphotos.com/photos/blue-wire/p47227-location-of-blue-spare-wire-under-dash.html