On ours there is a column of rocker switches on the front panel to the right of the instrument cluster. One of them is marked 'Radio Power'. The position of that switch determines the power source of the amp and radio. Main and Aux are the options. I just move it till it works the way I think it should, but I think Main is Chassis battery and Aux is House batteries. If you have it set to Chassis the ignition key would have to be in Accessory or On mode to power the amp. When you turn the engine off there would be no power to the radio or amp.
Make sense??
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Steve & Sherri
2002 Winnebago Journey DL 39QD
Thanks for the info. I do not have a switch like yours. Not an expert on tv or radio stuff but it seems like someone missed the mark on power to surround system.