01outback

yes they installed an aftermarket radio, if I pull the radio out will I be able to tell? I guess if they did not get the wire harness and just tapped wires together I can get the harness and do it correctly

I am the proud owner of an 01 outback and its my first Subaru. My dash lights are not working along with my running lights (tail lights) I have checked all the fuses and bulbs and there all good. What next plz help