How long do you play it for...In my 68 I have a direct replacement battery, and the stock alternator, and I can run 740 watts thru 4 speakers and a 12" inch sub for at least an hour with no problem...it would prolly last longer I just have never done it, so you should at least be able to last that long...if not have yer battery, alternator, and voltage regualtor tested cuz its prolly one of those...I real quick way to test if its the alt is to have the car running, and take off the positve terminal to the battery, and if the car shuts off its prolly the alt...good luck, hope this helped
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