i checked out the new 04's with the nav at my local dealer.. i asked them if the nav could be installed in the 03 hummer..they siad the wiring harness was different..i also called delphi and they said the computermay be different in the models. But i was wondering if anyone else knew some more info on this. Becuase if i bought the unit i'm wondering if a good installer could change the harness or install the unit.
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