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There are two power sources - one switched with ignition & one constant power - these devices all need constant power to maintain the memory. The simplest example of this is the radio - all radios have this feature so the station memories, sound set-up etc are retained when unit is powered off, but the main power for the system is via ignition (or accessory) power.So each time you started the car, you were just beginning with a "blank" memory, but it would still function.Incidentally, not all fuses blow with a black charred appearance - it really depends on how much current surged to melt it. This sounds like it may have been a mechanical break, not caused by electrical current surge.
There are two power sources - one switched with ignition & one constant power - these devices all need constant power to maintain the memory. The simplest example of this is the radio - all radios have this feature so the station memories, sound set-up etc are retained when unit is powered off, but the main power for the system is via ignition (or accessory) power.
So each time you started the car, you were just beginning with a "blank" memory, but it would still function.
Incidentally, not all fuses blow with a black charred appearance - it really depends on how much current surged to melt it. This sounds like it may have been a mechanical break, not caused by electrical current surge.
