the BIRD is basically a sensing unit, that the brings both battery banks to the Charging system via an automatic relay, or 12v DC Continuous coil(solenoid, as some refer to).
you may also have a dash mounted AUX or BATTERY BOOST switch, which effectively does Exactly the same thing, except that it is to bring both battery banks together, temporarily, for starting the engine, or starting the generator, or moving the slides, etc, if either battery bank is too low at the moment.
It also uses a 12v DC coil, but may be a differing size or brand from the other.
Mine uses a WhiteRodgers 12v DC Continuous coil for the BIRD...
and a Trombetta 12v coil for the 'AUX' or 'BatteryBoost' manual dash-mounted switch
Also, your USE/STORE door-side momentary two-way switch controls the RV CUSTOM PRODUCTS latching relay, which is similar to the other devices but only 'switches' to CONNECT or DISCONNECT the House batteries from everyday usage, otherwise to help keep your batteries in storage longer without many draws, though their will also be a few small ones regardless.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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