crazy popping action

[hellabent]

Dont know if this is a ground loop or not but... I have a pioneer h/u, 2 punch 800s. I recently had to change my fuse and fuse holder under the hood due to it melting together. So I replaced it and now when I turn the system on and off it has a loud popping and i can hear a high pitched noise. Then once I crank the engine it has a very loud engine noise. I have checked all grounds and all are bolted to thick metal. This only happens when i have the rcas from the head unit plugged into the amps. I can take an ipod and plug it into the amp for mids and highs and it works fine. Every thing was working fine untill i changed the Fuse holder......Any help would be great as ive been going around and around with this problem. //content.invisioncic.com/y282845/emoticons/greedy.gif.5a53e6246569d7ab79867170f3b06629.gif

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[phemps 10+ year member]

heres your problem.... pioneer head unit. you need to ground your rcas to the head unit

 

[hellabent]

Will do...thanks. Why does this problem just out of the blue happen tho....system worked fine for a few years. Did i beat the **** out of it?