The start position of every car I've seen, cuts power to accessories. Even if you disconnect the starter, and there is no power draw, the start ignition position will kill accessories. If it was really a current draw issue, then the headlights would shut off long before a stereo that draws only a few amps. And my headlights certainly don't shut off when I'm cranking the engine(I bet yours don't either).
The solution is to reroute the ACC feed to the stereo, so that it isn't going through the start position.
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