Alternator overcharging battery?

Why is it over charging? Well gee don't have any ASE certificates hanging on the wall, in fact I don't even work on Passenger cars or trucks, but here's why its over charging, Your alternator being called an alternator because it generates alternating current, as in AC voltage, in your case about 60 volts, whereas it is routed through what is commonly known as a voltage regulator, which in fact is incorrect nomenclature, as that's a throw back from the days of old when the Generator was used which generated DC voltage, the regulator regulated the amount of DC voltage due to RPM to the battery, somehow the name stuck, what you now have is actually a Rectifier which changes the AC voltage to DC voltage, rectifying the problem so to say, the most common is the Zener Diode Tree, basically its a series of diodes and resistors in some cases, or the Avalanche Diode Tree, which is basically the same thing but different, and I will not bore you with the details, somewhere in this circuit a diode has failed allowing to much DC voltage to pass, the rectifier is still changing the AC to DC but its not cutting it down enough, remember your still working with 60 volts AC, normally you see a total failure and the Alternator and rectifier fail to put out anything, except maybe about 5 volts AC, its a fail safe built into the diode tree, So that's why, and yes I do have many certifications, just not in the automotive field, think much bigger more complex multimillion dollar machines,

Alternator Overcharging

It's not uncommon for alternators to be bad or go bad shortly after installing out of the box. If its bad it can under charge and also overcharge. If your mechanic said it, he's probably right. Change the alternator and battery at the same time and hope you are good. Make sure you get yourself an alternator and battery with a good warranty and stay away from the remanufactured and budget crap. Ask your mechanic if he has a higher quality brand available.

When you park your car overnight or for several days, your battery still has to power things like your alarm system and other electronics in your car. Whenever you have funny electrical things happening like your power door locks working by themselves, there's reason to believe that too much power is being drawn from the battery while your car is parked. Make sure all the courtesy lights are turned off and that you haven't left something plugged into the cigarette lighter socket that is drawing power when the car's parked. Your auto shop technician will try pulling the fuse out that powers the door locks to see if the current drawn from your battery while it's parked in his shop falls below about 1/4 amp which is the maximum "parasitic" current that should be flowing (on average) from your battery when it's parked.

alternator overcharging battery

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Because your installing aftermarket parts.. They just never work out, been at dealers and private shops and no the trouble you can get into with crap parts.. Get a dealer alternator replace your battery after cleaning tray with baking soda and water and live happily ever after..

Yea, your alternator needs to be changed. Theres too much voltage going through.

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the voltage regulator must be sticking in the alternator !