Scrounging Firewood (and other stuff)

[JRM]

Modern vehicles have a low voltage disconnect that will eliminate ignition off draw sources from the vehicle once a predetermined low voltage is detected. This voltage is generally enough to still be able to start the vehicle assuming the battery is otherwise healthy.
Of course there is always a chance the battery could randomly fail but in my experiences that would be the exception not the norm. There are usually warning signs before they go.

 

[sean donato]

Modern vehicles have a low voltage disconnect that will eliminate ignition off draw sources from the vehicle once a predetermined low voltage is detected. This voltage is generally enough to still be able to start the vehicle assuming the battery is otherwise healthy.
Of course there is always a chance the battery could randomly fail but in my experiences that would be the exception not the norm. There are usually warning signs before they go.

most computers shut down around 7 volts to protect themselves, won't fire up under that voltage.

 

[JRM]

Ford disconnects at around 11.5 volts, I've actually seen this myself playing the radio too long in the wife's Explorer. Everything shut down with a message in the EVIC. It wasn't happy but there was still just enough voltage to start the vehicle.