I would test your constant at the aftermarket harness and the ground coming out and if it’s low then maybe run a dedicated ground behind the head unit on that metal rail and see if that fixes it it’s probably grounding through your rca’s down to your amps ground because it’s a better path
You don’t have to bypass factory amp if it still works it sounds good if you just turn it on but run your remote to the pink wire behind the factory plug that should turn it on but you will have to connect it then turn truck on and see if it engaged
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