Stereo power question (help!)

Super T said

ACC. The constant is just to hold presets. Does it power off, or just cut audio? If it's cutting audio it's probably internal protection. If the whole thing turns off, that's a different problem! Does the stereo have an orange or orange/white wire on it? If so, what did you hook that up to if anything?

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It powers off, but comes right back on on it's own, doesn't lose presets. Best I can recall, the only wires it had that were not speaker leads were yellow - constant, red - ACC, black - ground, blue - power antenna (taped it off). My biggeat concern is that if the stereo is starving, what is happening to my light switch and other old wiring? I don't want to burn the car to the ground!