Alternator Gauge Reading High With 300 Watt Stereo System Installed---1969 Electrical System

When doing audio in these old cars never use the factory wiring. They can't handle the current and will burn up. I've seen people loose their cars because they wanted a huge system in an old car. Only wire I used that was factory before I rewired it was the main hot wire. Otherwise I had new wires. The capacitor is not just for amp cutting out and lights dimming. It's so the battery doesn't get drained out and so your alternator isn't constantly trying to catch up and recharge the battery as hard. Get a cap on that if your running subs. You'll save the alternator and battery in your car. It's an added source of juice for the amp.