PC2-32-4 Peugeot Citroen Car Radio iso Harness Adaptor. ISO Car Radio Harness Adaptor lead. An iso Car Radio Harness Adaptor lead allows you to install a car radio of your choice with out cutting any of the existing car wiring. All Car Radio Harness Adaptor Leads are ISO ended and will plug directly into most models of car radio. See Additional Information for Vehicle Applications. Suitable for vehicles on ISO connections with no switched ignition feed.