Heater/ Stereo issues

Hi all, I have a problem with my 91 Integra.
After installing an aftermarket stereo, I have had problems with the power to it cutting out when I turn on the heater blower, are these 2
systems somehow connected? it doesnt seem to be a fuse issue. Any ideas or suggestions would be very much appreciated.
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Apparently they are interconnected now... by mistake. The aftermarket stereo wiring is not right one way or another.
Mike
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