The BIRD is definitely a device made by Intellitec. The model
839 has the generator lock out feature.
It doesn't have to be activated if the user chooses not to. It's purpose is to inhibit the alternator charge voltage from activating the BIRD when the generator is also running.
Think about it. If they are both running, the BIRD is not needed anyway, and the possibility of the converter charge voltage confusing (or worse) the engines alternator and charge gauge is eliminated.
People will ask why the lockout is not needed, or used, when on shore power (converter charging) and the alternator is also charging. The conditions would be the same, but it's just that this probably wouldn't happen for an extended period of time like it might be when driving and running the generator for air conditioning.
Monaco was/is not a big user of the BIRD. They seem to prefer a diode charge path for some of their coaches.
