Over voltage protection relay blows a fuse if the voltage gets too high and this is how power is shut off to some devices. It cannot be restored without operator intervention, i.e. replacing the fuse. However if the connection between the alternator and battery is lost there is no way the alternator can control its output voltage which may be why lights glow brighter. I am guessing that the ABS etc is still being fed from the battery side of the fault and shutting itself down in response to reduced voltage at that point.