Are you still having problems? I just did a ton of troubleshooting and repairs to my 2001 Itasca Suncruiser entertainment system, sounds like a similar setup to yours. First step is determining if your system is all original. If it is, the output from the TV to the amplifier (Amp input) is adjusted by the TV volume. However; there are settings in the TV (mine is an RCA) that can change the output to three seperate modes of operation. One is using the TV speakers only, another is unregulated (constant) output, which would explain your problem, the third (the one you want) is regulated output with no TV speakers used. I don't remember off the top of my head the exact names of the modes as they appear on the TV menu, but I could find out for you. To access the menu, use the menu button on the TV or remote, then move to "setup", "sound", again, this is going completely from memory, so I could be off. My TV is an RCA, the AMP is DHS (hidden above the passenger foot area). Let me know if you need more info/details, I could go through mine and get more speciffic if you need it.