Trying to add a bluetooth chip to am radio

So I got a b body am radio to try this on before doing in my dart but can't get it figured. What I've done so far is splice the right output from the module to (what I think is) the input on the volume potentiometer. Then ran the ground output to the body of the radio. But I still can't get anything out of it. I did make sure the radio worked before doing this. If any of you fellers have experience adding aux inputs to these radios or might have an idea of what I'm doing wrong thatd be helpful. Thanks.