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Go here http://www.modifiedlife.com/1988-chevrolet-caprice-stereo-wiring-color-codes/
Black-ground red- antenna blue/white- turn on
wiring diagrams should be available at your local library... ...everyone should have a manual for their vehicle(parts store or dealer), and a local library should have professional shop manuals...
Left front= gray and tanRight front= dark green and light greenLeft rear= yellow and brownRight front= dark blue and light blue
They're all wired for ISO, so just get the adapter for your brand of stereo to ISO instead.