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11.5 volts indicates a dead alternator. Running off the battery. Charge the battery if you can, get it over 12.3 volts after being off the charger for 15-30 minutes.
Did you test the alternator with the engine running? It should be putting out over 13.5 volts depending on the state of charge of the battery. Try jump starting the car with another good battery, but DO NOT run the engine or REV the engine on the good battery car.
regards
Mech
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