My radio went out. 1993 805 GLT. I bought a lot of used radios (6) only one came with codes. How do I retreive the codes for the other radios. Thanks ahead for any ehlp anybody can give

 

You will need to get it from the dealer. Typically they use the VIN but since you have used radios you will need to provide them with the S/N. I would call them and ask to make sure you bring everything they need. Most if not all dealers don't like giving the codes out for fear of stolen radios.
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Mine was locked when I bought my 850 as well, but luckily my radio code was in my handbook, if its not there, then consult the dealer