OK more info...
The relay is the same relay tied to the AUX start switch on the dash. When it trips itself it no longer functions on the dash (by listening) but if I hit the dash switch a few times the relay will reset.
Also.. when it clicks and trips converter starts charging both chasis & house batteries (verified with multimeter).
Any thoughts on what is causing the relay to trigger on its own?
I checked my owners manual, it doesn't have anything like you described. It did say the the chassis and coach batteries are charged by the alternator and that the converter is for the house batteries.
Maybe i need to try and trace the wires from that relay... sounds like a project.