my dads 1971 elcamino has a 383 stroker motor. the issue is that when you have it in drive and you idle it like at a stop light it only does 400 or 500 rpms. well this causes a problem because the voltage drops to 10 or 11 volts depending if the air conditioning or headlights are on. my dad thinks he could just add a second battery in the back to keep the voltage up. im thinking if he does the big three in 0 gauge and gets an xs power battery the voltage will improve. right now we have a 165 amp alternator, some super-start battery and 8 gauge wire. so what do you guys think. any feedback is appreciated