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Periperal Gmco, Some Sound And Very Loud Pops!

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Hello Everyone, new here, well kinda ive been here alot since I purchased the ss but now I need some help! I had the factory six disc Bose HU that wouldnt eject disc, so I replaced with a aftermarket HU. I used a Periperal GMCO harness, thats what the guy said I needed. Hooked it all up and it works, but only sometimes. It will make loud popping noises and screeching, go from front speakers to back speakers only. I have no clue what it could be. The door chimes and everything work fine , but some of the screeching seems to come through the gmco box. Any help would be very appreciated!!! thanks.

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