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Does it go dead after sitting for a few hours? Once started and driven for several miles will it restart if the engine is shutoff? If the battery goes dead only after sitting for a while with the engine off, you probably have a bulb or some accessory that is draining the battery.
First you can not test an alternator by disconnecting the battery cable. That is what we did back when cars had generators. Today you can fry the computer and alternator running the engine with the battery cable off. Meanwhile, I would look for a fuseable link or main fuse problem. The alternator circuit may not be connected to the fuse box and battery.
you may have a problem with the alternator sometimes not charging,may test okay sometimes, take a good look at the alternator and also make sure nothing is staying on, like inside lights, glove box light or brake lights, keep an eye on these things when parking the car for the day,something may be draining the battery down slowly.
sounds like your alternater is not fixed. Your car ran off of battery power till you drained it. Complete alternater repair and charge battery. You can check if your alternater works by starting car and disconnect positive cable if it stays running your alternate is fixed. Shut car off and replace positive cable.
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