2006 toyota highlander

Hey guys, I just recently installed a new stereo in my car and (after getting the wiring right 🤦🏻‍♂️) I’m getting a constant hiss in all speakers, and a popping noise when the volume goes to zero. When I go in the back to check the wiring, I sometimes get a loud crack/pop when fiddling with the...

So I’m replacing my cars radio, and in the user manual for the wiring of the new radio, it says to test the radio (before installation) it says the ACC wire and the 12+ V wire should touch the positive pole of the battery and the ground wire should touch the negative pole in order to turn on...