I think my alternator went out. My battery light is on when the engine is running. I have a sound system with about a 1000 watt amp, a few gauges and the oil pump for the turbo. Combined, it all draws quite a bit of power. What amperage alternator comes stock on my engine and what amperage alternator should I put in to compensate for the extra power consumption? I saw a 105, 145 and 160 amp on the O'Reily website.