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Hi,Thank you for using Just Answer my name is ***** ***** I will help with your question. I think the problem is down to the yellow wire on the connector at the back of the stereo. The yellow wire should be connected to a permanent 12v feed, it is this wire that keeps the radio alive so that it rembers all our settings if this wire is not connected or connected to a switched 12v feed the radio will forget everything each time you turn off the ignition.If you could let me know how you wired the stereo and the type of car I will be able to help more.
Did you have any problems with the old stereo?
Sorry for the delay do you have access to a multimeter?
One thing to check is that the red wire of the car is connected to the red wire of the stereo and the yellow wire of the car is connected to the yelllow wire of the stereo.