first, Â*make sure your alt is good, and get a new battery. a bad battery can ruin an alternator and vice versa, so if one goes bad, the other will soon follow. Â*witht he car off, chekc the batt voltage should be around 12.1, then when its runnign, check the voltage comign off the alternator, should be 14-14.5 volts, and also chekc at the battery, it should be very close to the reading at the alt. any more than 14.5 and thats a big problem. also check the battery wires and terminal for corrosion, if they're really bad, replace them or clean them very well. Â*Also, just to be on the safe side, check the electrical system for a drain when the car is off. i know it doesnt sound like a drain but check anyway. Â*disconnect the neg battery terminal and put a test light between the neg cable and the neg terminal, if it lights, there is a drain. Â*try pulling fuses until they ligh goes out, once it does, you know what circuit is causing the drain. Â*All in all, it sounds like just bad luck. Â*batteries have 6 cells , 2 volts each. Â*if one cell shorts out, the battery will test at right around 10 volts and will nto be able to start a car and is also very hard to jump start. Â*I just helped karl, speakersgoboom, with a similar problem, car wouldnt crank or anything, even when jumped, all it turned out to be was the battery. Â*so get a volt meter and get to work and i hope you find the problem. good luck.
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