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Good call Cal Metal.
Start the car and pull the battery connection. If the charging circuit it working, the car should stay running. Check the voltage across the terminals that would be connected to the battery.
14V +/- .5V will work. However, the alternator may read this as a dead battery and run the voltage up to as much as 15.8V.
If it reads erratic or low, could be a diode as Cal Metal suggested.
Hope this helps.
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