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1988 Coupe Deville, 1991 Coupe Deville, 1989, 1994 Eldorado
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Upgrading to bose it very iinvolved.. I did it on my 94 eldo..you first have to know the wiring ... I suggest that you get the wiring diagrams for the non-bose and bose models for your year.. figure out what you need (speakers, amps, wiring harness, cdm box) as all these are different in the non-bose models..
I was lucky I was able to find a few in the junk yard and dissected out all the wires, parts, diodes, and grounds.. then had to wire it to the max fuses that are under the hood... my car was appart for weeks.. but it was worth it.
hope this helps
 
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