I believe that the 12v battery is charged via the HV battery with a DC-DC step down convertor. I don't even think there is an alternator as the electric motor (one of them anyway) acts as a generator to charge the HV battery.

-Tim

2006 Mercury Mariner Hybrid AWD
Black with Pebble interior
Premium Package with Nav & Moonroof



Current ODO: 26,152
Typical Drive: 20 min crosstown in heavy traffic (3.5mi there and back twice a day)


532 Gallons of gas saved
That's 10,642 lbs less CO2 emitted