So I did a google search on 2001 F53 wiring diagram and came up with several hits. This is a link to an append in the IRV2 forum where he says that the blue wire for the brake controller was tied up on the left chassis rail at the rear of the gas tank.
http://www.irv2.com/forums/f23/2001-...ng-256577.html
I know the feeling about not being able to get up. 64 with two two shoulder surgeries. Sucks getting old.