This high quality harness adaptor lead enables the simple installation of any aftermarket head unit where the original equipment audio system incorporates an amplifier. It enables the continued use and integration of the original amplifier after the aftermarket head unit is fitted. The harness is terminated with original pattern connections for a secure plug-in fitment. There is no need to cut any of the original vehicle harness avoiding invalidating the vehicle manufacturers warranty. The ease of connection dramtically reduces fitting time.