Remember, a good battery should have at least 12 volts. Check it before connecting the cables. Check it after installing the cables. Check the voltage with the ignition on but engine NOT running and engine running (preferably AC and all the other electric accessories off).
Engine running, the alternator should be making more voltage than the battery, usually at least 13 volts, especially more than the voltage with the ignition on but the engine NOT running. If its the same voltage with the engine running as it was with the ignition on but the engine NOT running, likely the alternator is dead and NOT producing any current/voltage.
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