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Q: check charging system on 2005 Lincoln LS

while driving on-board message center indicates check charging system and the battery indicator light comes on, the spedometor goes to 0 however RPM's remain normal the radio cuts off, my sterring becomes tight and the car shuts off and will not start, no lights working in dash and hazard lights go on and off outside the car.I get a jump and the car starts but shuts right back off immediately. New battery has been replaced less than 90 days any suggestions/ideas?
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Charge the battery to a full charge. then check to be sure alternator belt is tight and battery cables are clean and tight. Have the alternator output checked it should be about 14.5 volts. If you are not getting 12 volts to the PCM you won't get the other reference volts to the sensors needed to keep the engine running.
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