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Like a lot of others my battery went out. I had mine stored from November to April. It started right up the first time in April but the second time mine did the same as your. I jumped it and went and bought a Deltran Battery Tender Plus and all is well now.
To test the alt. start the car.
While running unplugg the negative cable.
If the car shut down, the alt. is dead.
Please do NOT do that. The battery acts as a capacitor to smooth the electrical flow. You can fry something by running the car without the battery in the circuit.
OP, I had the exact same problem earlier this year. I replaced the battery, but it ended up dieing again about a month later. In the end, I had to replace the alternator. Haven't had any problems since.