The dealership (and good independent garages) will have a "power pack" that
they plug in somehow to keep the circuitry alive while the battery is out
of the loop. I don't know if there's a cheap equivalent for home use.
I recommend getting the pro's to replace your battery, that way you don't
need to worry about the radio code.
Does the cigarette lighter have power with the ignition off?
If it does, a battery charger connected to it would probably do the
The voltage will go up to 16 volts but the electronics should be able
to take it,
What if the batteries are changed with the engine running?
Again the voltage will go up to 16 volts
If the electronics fail, that is a bad design. If we have a bad
battery connection the electronics fail !! ??
I don't recommend this but I probably put the 2 batteries in parallel,
remove the old one without disconnecting the parallel configuration,
install the new one and disconnect the old one.
Do not follow my suggestions. I have been told that I like to take
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