Need advice on aftermarket audio installation
I have a 2014 Laredo with the base 6 speaker audio system and RA3 radio.
I installed all new speakers and ran new wiring to put them on an amplifier. The issue I'm having is that I absolutely cannot get interference/alternator whine out of the speakers. Everything I've read up on is that it's probably due to a grounding issue. I've moved the ground to multiple places in the vehicle, even connecting it directly to the battery and it still didn't fix it.
The first install used an audio control LCi2 LOC but I got rid of that because I think something is fried in it (I had used it in another vehicle and it was doing weird things to the sub when connected).
So I decided that I would instead use kicker speaker to RCA adapters for the inputs to the 4 channel amp. I spliced into all 4 speaker leads (right front and rear and left front and rear - I know that sounds like overkill but I was running the wiring anyway and it eliminates the need for RCA splitters) and using the output on that amp to input into my sub amp.
I've rerouted the wire to keep it separate from the power and ground, bought a ground loop isolator, changed amps etc and nothing has fixed it.
Is there something I'm missing with these jeeps that's causing this? Is there an optimal place for the ground to be or is there something else I need to splice into? The only thing I haven't done is take out the passive crossovers from the tweeters. Could those be picking up interference and passing it through the speaker wire? I'm just at a total loss and I'm really tired of tearing everything apart and moving it to just end up with no solution.
The speakers are kickers in the doors, alpine tweeters, and the amps are a hifonics ZRX616.4 and a pioneer GM-D8601.
Any help would be greatly appreciated.