Sounds like the "switched" power wire was hooked up, but the "constant" power wire was not connected when the deck was installed. The constant power is independent of the ignition. Basically it is an always on, direct link to the battery. It provides just enough power to the deck to "remember" it's settings. This includes DSP and bass & treble settings, as well as radio presets. To test this, set something(for example the treble setting) to maximum, then turn off the vehicle. When you turn it on again, if treble is at zero(or whatever it's default setting is) then that is probably your problem.
It is necessary to disconnect the battery to safely install a starter. When the battery is disconnected the radio loses its presets due to no power going to it.
Random Access Memory (RAM) is the kind of memory that loses its content when the computer power is turned off.
You need a battery. There's a very small chance it could be something else, but from the symptoms you describe it is more than likely a bad battery.
Volatile Storage
all European PT Cruisers have a radio unlock code that needs to be entered in the event the radio loses power. USA domestic PT Cruisers do not have a radio code
It loses one or more of its electrons.
dehydration
dehydration
Random Access Memory (RAM) is the kind of memory that loses its content when the computer power is turned off.
The small spark created by the contact of the switch created radio frequency waves that happen to included the frequency of your radio.
Random Access Memory (RAM) is the kind of memory that loses its content when the computer power is turned off.
true