My point in my first post was that the battery would absorb the initial
transient in Ellipse's scenario. The system voltage would never reach
the level required to trip the overvoltage protection. If the battery
or its wiring were in poor condition, then the overvoltage protection
device could trip. Today's radios would not be threatened in either event.

Dale,

I agree with you.
My point was just that the battery *could* be unavailable to soak up the
load dump consequences, rendering the OV protection indispensable
whatever the case.

Best regards,
Gilles,
http://contrails.free.fr