CHARGE OR REPLACE BATTERY IF BAD.CHECK ALTERNATOR OUTPUT AT BATTERY WHEN CAR GET RUNNING.VOLTAGE AT BATTERY SHOULD BE 13.5 TO 14.5 VOLTS IF NOT ALTERNATOR FAULTY.CHECK ALTERNATOR FUSE AND ALTERNATOR WIRES.MAKE SURE DRIVE BELT NOT SLIPPING AND BATTERY CABLES ARE TIGHT AND CLEAN FREE FROM CORROSION. IF ALL IS GOOD.ALTERNATOR IS BAD.THAT COULD BE POSSIBLE CAUSE OF DEAD BATTERY. IF BATTERY 4 OR 5 YEARS OLD.IT COULD BE BAD BUT IF BATTERY OKAY STILL CHECK BATTERY AND ALTERNATOR PERFORMANCE.
Have the battery load tested at autozone or if you are in canada .. canadian tire. can't remember which place does that in australia
Check for battery to motor ground and battery to body ground for corossiion under bolts, also check for motor to body ground strap for corossion
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