have an 86 300sdl and the grand prix won't come on,when i press the on button i just get a chatter from behind the radio,at least thats where it sounds like it's coming from,any ideas??

Max at 300SD.com had this same problem... hope this helps:

http://300sd.com/?p=260

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1981 300SD -- Sold Back to PO... POS
Vancouver, WA