Car Electronics Questions? Ask an Electronics Expert for Answers ASAP
If it's not holding memory then your Yellow wire (memory wire on the radio) is not connected to the battery and is instead connected to the switched ignition wire. This is the only thing that causes this. If you're insure what wiring you're interfacing then use a multi-meter and find the CONSTANT power wire in the car so you know which one remains ON/LIVE even when the ignition is shut off. Of, run a new length of wire right to the battery with a small fuse near the positive terminal (10 amps is fine). This ensures your memory is retained when you shut the car off. On an aftermarket stereo the wiring is as follows for power:
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