Stereo power question (help!)

Do any of guys know which of these wires the stereo draws it's "amp" power from (constant or acc)? I noticed that this morning, the stereo would turn off if the volume was too high. I think it is pulling to many amps for the wires I hooked it up to, again, it's not a "high-powered" unit. Would a bad ground do this? I forget what I used for the ground, I think a screw in the dash.

Thanks for thinking about this - I hate electrical stuff!!

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?