Gordiegaffer-
Is your coach built on the Ford or Workhorse chassis?
According to
this diagram:
Ford "blue wire" at hitch connector = YES
Workhorse "blue wire" at hitch connector = NO
If it's a Ford, the front end connector will be there as well. On your 2006, it will be up inside the dash, near the top-left of the steering column. Many people struggle to find the connector, but it is there. See
this post for additional information.