Perhaps you are attacking this from the wrong front...If the Stereo system is that much of a draw, add a capacitor to handle the voltage flux..Also add a second battery.
I added another battery tray in my 65 GTO on the right side. My alternator only puts out 100 amps.. Uses Duel electic fans, HID headlamps and 1000 watt amp to power the subs. So far no problems..
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With all of the modern advances in technology and medicine, there is still no cure for the common birthday - John Glenn
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