There is a TSB regarding the electric brake pre-wire issue. This is from Unified Tow Brake but pertains to any controller utilizing the factory electric brake pre-wire.
Background
Beginning in the Summer of 2005, Monaco Coach Corporation began pre-wiring its 2006 class A coaches (Monaco, Holiday Rambler, Safari, and Beaver).
Description of Problem
There is a "trigger" wire for the brake light switch that activates the brake controller. The brake light switch is to be "dead" when the foot is off the brake pedal, and "alive" when a foot is on the brake pedal. The wiring in some of the Monaco pre-wired coaches is backwards. They have the "trigger" wire "alive" when a foot is off the brake pedal and "dead" when the foot is on the brake pedal.
Monaco is using a relay for the "trigger" wire #197. They have the relay wired incorrectly. Monaco wire #197 is plugged into post # 87A and should be plugged into post # 87 on the relay.
Solution
The Monaco relay for wire #197 can be found in the coach’s electrical panel located in the front driver side bay. Once you have located the relay for wire # 197, you will notice that there is one spot on the relay that is not used. Move wire #197 to that vacant spot. That will correct the problem.