Help me guys! Bought a new Sony stereo unit, install kit, and harness. I got the adapter harness connected to the sony harness fine, removed the factory Delco unit, and plugged the new harness plug to the truck harness. But I got no sound. There was another small flat plug in the rear of the factory radio that has nowhere to plugged in now; retried the delco, and it wont give sound without it plugged in either. According to Crutchfield, Amazon , etc. I have the correct harness
(Metra 70-185. What is the small flat plug? And ideas??
(Metra 70-185. What is the small flat plug? And ideas??