I can confirm this as I jump started another car from the 12v battery while the truck was off but the voltage off the battery in the frunk was over 13v.Also I just read in the lightning owners manual that the high voltage battery charges the low voltage battery only when the truck is off. Is this different than with the mustang Mach E? Can anyone confirm this?
One would assume the truck would be keeping the low voltage battery charged when it’s running but I guess it does this when it’s off or charging.
the funny part was the driver of the vehicle I was jumping was in a hurry and was yelling at me “START THE TRUCK, START THE TRUCK” not realizing it was an ev. Anyway it started right up.