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No Rear Speaker Audio with GMOS-04


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I am installing an F700 in an 04 Escalade. I have BOSE and ONSTAR so I am using the GMOS-04. My front two speakers are working great but when I plug my rear speaker outputs from the HU to the inputs of the GMOS-04, it kills all of the audio. If I plug the RCA connectors together with just the center pins touching, i get audio. As soon as the grounds touch all audio is killed. Does anyone know what may cause this problem? Thanks in Advance

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