93 Mustang radio
My stock cassete deck quit working and I got a used one on ebay.It looks identical except there is no clock function. I plugged it in and it lights up, tunes , every thing but Very little sound. When I turn it up all the way it just wispers.I am thinking the amp is not getting power. On the power harness in back of the radio there is a blue and a black wire coming out. There are the same color wires on the amp. Is this a power coming from the radio to the amp on these wires? If so there is no power in either wire. Please help.