There are many causes to your condition. Shorted diode in alternator, bad voltage regulator, (most alternaters have them integrated within the alternator itself), or something is staying "on" in your electrical system, thus drawing the battery down. If you have a new battery to start with, then use a good VOM meter and check your charge back voltage when the engine is running. It shout read at least 13.5 volts or more. If it does, slowly add accessories to add to the load. First headlights, then blower and rear defroster, radio, wipers etc. The voltage shoud not drop past 13.0 volts. If after a few items turned on and the voltage drops below 12.8 or so volts, your alternator and or regulator is failing. If the voltage holds well at or above 13 volts when things are on, something is drawing power from the battery during the engine ignition off condition. In a darkened area, and make sure all doors are closed, no key in ignition, disconnect the negative side of the battery, and stroke it against the same neg terminal and watch for small sparks. (wear safety glasses) You might get a tiny one at first but then see nothing after. This is normal. If you constantly see small sparks coming fron this swiping action, you have a drain somewhere. Pulling one fuse at a time can help locate which device is pulling power, but unless your a seasoned electrical trouble shooter, bring it to a sharp electrical guy, to find exactly whats pulling your power away. Buy a special terminal cleaner tool, (round wire brush type), and clean your terminal clamps and battery posts shinny. Also check the belt tension on the alternator. The whole problem might be corroded terminals.....
-- dave_rose69
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