Myron,
I've done an extensive search back by the "Plug In" and also in the engine compartment with no luck. I'm told it is in one of the bay ceilings. I'm also told that the troubleshooting procedure for the box, once found, isn't easy. I'm considering a work around where I tap into the lights on the back of the motorhome. For the life of me I don't understand why Monaco would create an entire separate system for the "The Tow Plug connector" that isn't tied into the Taillight System on the back of the coach.