1st...never, ever disconnect the battery terminals when the vehicle is running.If you want to test the alternator's output, use a volt meter to measure the voltage at the battery when the engine is running. Your condition could be related to the battery itself, it may have cells inside that are shorting out, it could also be a bad terminal connection at the battery. What needs to be done is a voltage test to verify the battery condition and alternator output. I hope more problems were not caused by disconnecting the battery while the engine was running.
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