i need to replace my battery. i need specification. do i need to test the alternator before replacement?
Do you have a voltmeter or multimeter? Set it to DC volts and wth the engine off probe the negative and postive posts. The voltage should be 12.4-12.6V. Any lower and you will need to replace. If the car does start, then probe again, you should have a reading of 13.8-14.5V , this means the alternator is charging and working correctly. How old is your batter, any older than 4-5 years old is ready for replacement.
Also check your battery terminals for loose or corroded connections. Bad connections can give you false conditions of battery and alternator.
Yes Always check charging system
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