Another problem could be that a lot of these boards in radios and other equipment that hooks into your RCA's has little bitty fuses on them. When you just barley accidentally touch that positive prong of your RCA to the negative "jacket," while there is a signal (or sometimes not), it can blow those fuses and cause insurmountable grief. Mid to low level Pioneers are notorious for this. Have you tried (and I hate do thing this) grounding your RCA's?
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