help with buzzing sound coming from fusebox when stereo is up

[cmz829]

i have a 95 sho atx with factory stereo but i wired a old 12 subwoofer i had laying around up with the factory amp (it actually works quite well) and when i turn the volume on the stereo up more then half i get a buzzing/squelling sound coming from what sounds to be the fuse box the pitch increses with the rpms the sound is about talking volume everything seems to work find during this period. could it be strain on the fuse that the amp is connected to because of the subwoofer?

sorry mods can you please move this to the help electronics and audio thread it will be greatly appriciated

 

[Ferendon]

Ground loop isolation issues. Make sure the system is grounded well, and has enough power pushing through it. They make ground loop isolation kits to get rid of that.

http://www.crutchfield.com/S-kLCUFxBeAoM/cgi-bin/ProdView.asp?search=ground+loop&i=127SNI1

 

[cmz829]

would that still help me being that the factory amplifier if i remember correctly doesnt have rca connections

 

[Ferendon]

You hook it to the head unit, not the amp.

 

[cmz829]

the headunit is also stock and there is not rca outputs on the back to connect it to

 

[thecrew2999]

shocked the stock amp (85 watts) could make the sub sound alright.