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Look at the alternator output, Have someone do a load test on it and the battery. It sounds to me like you have (1) a bad diode in the alternator and your only putting out the minimum voltage and (2) the first item has caused you to break down your battery's capabilities also.
I am running a "Tuffstuff" alternator (140 amp with the capabilitiy to carry 85 amps at the idle speed (yes that is possible) Most standard alternators only carry 35 amps. I have only one battery and it is a 800 cold start amp unit. This supports (2) 11 inch SPAL electric fans, headlights, A/C, and a 300 watt stereo system. I have no problems with the system and it works great.
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