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The radio has two pins for power connection. The one is active only when the carkey has been turned, the other is always live with 12V to keep the radio settings. It sounds like it is only powered by the key dependant power, and not the "always-on" for the radio memory.
You have probably lost the frequency settings on the memory when the battery was replaced. Please follow carefully the way to set up your memory once again. swittch on the radio, scan for manual/ auto as desired. if the signals are strong you can scan/seek search and memorise. if not scan and select the channel location and press the preset button to store according to your need. Also chose the clock setting and set the time by scrolling, shift to the next digit and set. Hope this advice helps. Good day
Kenwood radios have a yellow memory wire and this wire needs constant power even when the switch is off .thats what holds your memory. make sure it is not connected to the red wire. the red wire is a switched connection and should go off when the switch is turned off. this is the radios main power. Hope this helps write back if not and if so leave feedback.
The memory is supplied by an 'always on' source in the car wiring. Often this supply is shared by another accessory like a dome light or lighter...is something else (that doesn't need the key on to work) not working? You must check the fuse panel for blown fuses. Car manual will show location.
You have not installed your radio correctly........
there is suppose to be 2 power in for the radio 1 that holds memory for the radio has to be picked from a line that has power available to it even if the car is switched off and the other just to switch on the radio itself...normally responding to ignition check
to verify that you have connected the memory power for the radio
correctly and that that line has power even though the car is switched
off...... use dc tester to test that it has power available
This is usually caused by having the memory and power connections swapped (one stays on all the time, to store stations etc, and the other turns on with the ignition to provide the main power)
Try swapping the two power wires over - they're usally thick yellow and red wires IIRC, and almost all modern stereos have in-line 'bullet' connectors to let you swap them over easily (because not all car manufacturers have them the same way around!).