This is a bare bones old school sq head. I wish I never sold mine. The only think I ever heard was close to an aux input was I heard some had found a plug to make the cd chager port act like an aux. Other than that, it is a cd only type deal and it didnt like burned discs much either. Ebay is going to be your best bet for a wiring harness. United radio used to carry some parts and items for eclipse but it has been years since I had my unit or called them. I went to an 8454 to get processing, but it doesnt sound as good as the 5303 did.