I have a 2018 lexus 4gen rx350 fsport and just spent three days installing new door speakers and wiring 2amps and FAILED, So i purchased a PAC 30 pin harness to install it to a LC7i and then to 2 amplifiers, so I installed it to the factory amp harness and I installed the dash speakers to factory amp and door speakers to the LC7i, the dash speakers worked and the LC7i is not reacting to signal so now I'd like to know if maybe the harness should be connected to the radio I stead ? IDK ....WHAT DO U GUYS THINK?

 

Aren’t the speakers supposed to be connected to the amplifier (all of them) and the amplifier connected to the lc7i and the lc7i connected to the factory radio speaker level or rca level outputs?