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Have you got a Multimeter?
Did it have the original stereo of an aftermarket one?
you need to have a constant power source to the radio or everytime you take out the key you will lose all stored info,usually 3 wires need to connected to run the radio,most of the time they are red,black and yellow from memory,sometimes there is a brown one
once you have a constant power supply from the batt to the radio you will be fine