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.

 

An update. I went to a few local bone yards to look for a radio. Have no luck finding one for a 93 Mustang. Turns out the one I got on ebay was out of a Taurus. It would not work. I went to an older yard and on the shelf they had one from a 92 Explorer. It had the same plugs as the Mustang one.I plugged it it and it WORKED!! All I had to do is riviet the bracket for the bin that sits below the radio. So this is another option for the 93 Mustang.

 

I'm glad you got it to work, you didn't want an aftermarket radio?