2000 Ford Windstar Driving Night Headlights Started Pulsating Radio Gradually

2000 FORD WINDSTAR
140,000 MILES
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when driving at night the headlights started pulsating to radio, gradually going out completely. this was followed by the radio and dash lights going out and engine surging. in less than a minute, everything came back on. the next time I tried to start it the battery was almost dead and blower motor relay was clicking rapidly . any ideas?
Dec 27, 2012 at 8:05 PM
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CARADIODOC
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Generator is quitting and the battery is running down to keep the engine running. Measure the battery voltage while the problem is occurring and the engine is running. It should be between 13.75 and 14.75 volts.
Dec 28, 2012 at 6:44 AM
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