After I read 6Cuda6's response it all made sense...
...there are two solenoids that operate together to connect the two batteries for the "boost" selection. The solenoid I was asking about DOES simply bypass the circuit breaker. It does this because tying the batteries together and then trying to start the engine would easily draw more than 60amps (and pop the breaker). The breaker is there to limit total current to the house 12vdc systems to 60amps when not in "boost".
Thanks to everybody,
ps: It is really impressive how well this community supports each other.
That is also why the systems that have this feature also have momentary boost switches.
And to Jim.....
"You ain't seen Nothin' Yet"
Time may come that you will get to see this community in action.
I can only hope you get to witness and not have to partake of this community's amazing support.