I want to use an oldish power supply to power like a car radio and possibly an amp. I can't find anywhere as to what cables to use off the power supply. I have tried the 12v 4-pin cpu connector an it fried a radio from there I'm kinda stumped. Any ideas as to witch ones to use, I have two or so radios left to try it on before i use the good one. I hope this is possible, because power converters are kinda expensive. TIA