COULD BE LOOSE ALTERNATOR BELT.TRY ADJUSTING ALTENATOR BELT SEE IF HELPS PROBLEM.IF ALTERNATOR NOT CHARGING BATTERY THE ECM CANT WORK NONE OF ENGINE CONTROL SYSTEMS.IF ALTERNATOR DRIVE BELT TENSION CORRECT REMOVE ALTERNATOR TAKE TO ANY AUTO PARTS STORES THEY WILL CHECK IT OUT SEE ITS WORKING OR YOU CAN TAKE DIGITAL OR ANALOG VOLT METER TO CHECK ALTERNATOR OUT PUT AT BATTERY WITH ENGINE RUNNING SHOULD HAVE 13.5 - 14.5 VOLTS IF ALTERNATOR IE CHARGING THE BATTERY.
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