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My understanding of the TRC-502 is that it is 49 MHZ not CB. With that said I cant find
a microphone diagram for that specific radio. I found a 503 but that is a CB. I couldnt find a
wiring diagram for either radio. You could always call Radio Shack or The Shack, contact them online or call and ask for the info. Call: 1-800-843-7422 http://www.radioshack.com/home/index.jsp
You have not specified which country, state or county you are in so we cant even suggest a shop in your country. Find a local CB dealer and take the radio there, they will be able to wire up a microphone for the radio.