@madmike1157, I know you have audio equipment experience so I'm going to ask you for your opinion. What are the typical causes for accessory pop through the speakers when turning on lights and other high current accessories? I finished up my audio system install, adjusted the gain on the amplifiers, and started playing some music. Everything seems to work fine until I turn on my parking lights and headlights. I get an audible pop. It's faint, but it's still there.
My two dash speakers are not fed by the amplifier. They are fed directly for the head unit. The other 4 speakers are fed by an amp along with the subwoofer fed from a second amp.
The RCA cables are not ran parallel to any power sources. Amplifier power and grounds come directly off the battery. I've read that the amp turn on lead from the head unit could cause some issues, and some recommend to use that lead to activate a relay to turn the amps on. I've also read that some say to run the ground and power to the head unit directly from the amplifier so everything is seeing the same reference.
I think the pop is only coming from the amplified speakers. I need to disconnect the amps to find out for sure though.