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Yes that is true BUT
most of the time this is simply a dirty cable to battery connection.
Did you clean the cable connection down to silver color inside when you changed the batt? Folks buy new batts all the time when all they needed to do was clean and tighten them.
With the engine running put volt meter test leads one to ground and on each side of of alt out wires one then the other. should be 13+ volts
then put them on each side of battery and it should be the same. If not take it to the Auto PARTS store and have them check the alt for free.
Most auto parts stores offer free Alternator testing takes 5 mins. if the Alternator is good and will hold a charge,then your problem sounds as if it is a spark plug/ fuel mixture issue,,check plugs and plug wires.
you have a pulley that is off center more than likly the alt!! if not have you changed water pump/ power streing/ alt/ idler pully/ if so ck for alignment thats the only way or and i cant forget please check to make sure the auto parts store gave you the right belt for your car duble check with oyher parts store and see if they come up with the same number as the one you have
test and check battery and or connections to and from alternator also check the connections for the abs sensors may have a loose or damaged connection if looks good than have car scanned for trouble code [even with light out compute still stores code] some auto stores such as auto zone / advanced auto scan for free check ur local area the code will give u a start point towards fixing ur problem good luck
clean the IAC it is all you need to do. Battery voltage drops just because when the engine stalls it kills the alternator. Engine stalls beause the Idle Air Control (IAC) valve is dirt clogged. Uninstall the IAC valve, and clean it using electronic contact cleaner (3M will do). No need to spend anything else.
What are the voltage readings? Voltage may drop when idling and a larger voltage drop can be present when a large load (amp draw)is present on the alt. A low charged battery is a large load. Operating accessories is a large load. A slow spinning (idling) alt will not put out it's max output. This would be normal.
We like to see.....above 12.7V at idle....max 15V....... .......and a min of 13.5V to a max of 15V at higher engine speed. If you are with-in this.......don't worry about it.
I would go to advance auto parts and have the battery tested, Also the alternator, The engine wont run if the alternator is bad, As soon as the battery goes dead the car will shut down, Any auto parts store usually will check the battery and alternator for free, make sure the battery is fully charged before you take it there. They will let you know what you need to replace...