Re: Need help grounding factory amp/sub...
What is that double RCA thing for on the HU? Is that the sub preouts?
Turn on pop happens when the amp is powered up before the input source is stable. It's not a ground problem. There are ways to fix it but first you should make sure it doesn't pop with the RCA's disconnected. If it does you need to figure out exactly what those 2 blue-white wires do 'cuz you'll probably have to wire them differently.
1999 Buick Park Ave Ultra
Head Unit: JVC KWHDR720
EQ: Audiocontrol EQL
Front Stage: Hybrid Audio Technologies Imagine 5.25
Sub Stage: In process (will be Boston G310)
Amp: Boston Acoustics GTA-704 4 Ch
Rear Fill: Boston SE953 6X9's