Many regulators have too low output voltage to properly charge an AGM battery. The average output of a car alternator may vary from 40 amperes to 120 amperes.
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Pushing the charging voltage to 18V seems like flirting with that problem.
. The post you referenced looks like someone is reading the volt meter explanation as expected charging voltage range. Someone else called him out on it and. You should be just fine.
A reduced output may be a sign that the alternator is failing but the drive belt and wiring should be inspected before replacing the. Since an alternators output can vary both up and down from 135V in real-world situations its actual output limits will vary from the idle and rated numbers. Some high amplitude alternators can produce up to 300 amperes of current.
The alternator should be tested with the engine idling and electrical accessories such as the radio and headlights turned off. The last number is 135V which is VT or the voltage that the alternator was held at during the test. Thats enough constant voltage to recharge the battery without overloading your cars electrical components and circuits like the instrument cluster car battery headlights motors and so on.
For most alternators a voltage of about 13 volts is normal while for some a voltage of a steady 135 volts is evidence of an issue. You can carefully tap it with a hammer while the car engine is running while checking it with a multimeter on the car battery to see if the voltage is changing. When the engine of your vehicle is running the voltage of your car battery should be between 135 and 147 voltsDuring that time the alternator of your vehicle is busy charging the battery.
Somehow the car battery voltage can be below 135 volts. Feb 20 2017 at 1410. A car alternator needs to be putting out at least 13-14 volts ideally between 138 and 142 volts to effectively charge a 12 volt car battery.
The most common reason why your car is not charging the battery is actually because of a worn-out or damaged alternator. The last one I checked was holding steady at 144. Even with the new car battery you dont need to charge for starting the car.
You know at the time of engine running the alternator will charge the battery. Therefore a voltage appears that is higher than usual. The voltage when the engine is running should be in the range of 135-147 volts.
Voltage when the car is running. The alternator determines how quickly the battery is charged. The actual charging voltage designed into a voltage regulator is dependent upon factors such as how far the alternator is located from the battery and the ambient air temperature surrounding the battery as calculated by the PCM.
But 15 volts is too high for an alternator and 12 volts is too low for an alternator. To prevent that the voltage regulator functions much like a linear regulator in that it ensures the alternator output maintains a steady charging voltage of between 135V and 145V. An alternator should put out between 135 and 15 volts of power.
The only way you would see sustained voltage above 15 is with a bad regulator. If you see your alternator voltage between 13 to 14 volts that tells your car alternator is operating properly. The voltage of a normal alternator is 12 volts.
When the Car Is Running. If the alternator is putting out too much voltage 15 volts it is likely your battery acid will boil over out of the battery. When your car is running the cars alternator is charging the battery this is why you should see a higher voltage.
About 142V is the maximum charge that can be applied to a fully charged 12v battery. Worn out carbon brushes or damaged alternator. Nonetheless there are different models of cars with different engines or batteries and alternators.
A standard alternator that charges the car battery during starting and the voltage range while running the car varies from 125 to 135 volts. These voltage levels are enough for most of the bulk charge stage but a bit too low for a proper absorption charge which would take a voltage between 142V and 149V depending on the temperature and the battery model. If the voltage is precisely controlled by PCM that seems possible.
The charging voltage was consistently 138v whether the car was in idle with no load idle with a lot of load high beam and rear defroster and fast idle with load and no load. Fifteen 15 volts charge denotes the fault of the voltage regulator of the charging system. For high power systems the alternator voltage may range from 24 volts to.
Check this helpful post to know the details. Not to mention the damage electronics in the car would take when run at 18V. Typical regulator setpoints are 135V to 144V.
Good alternators measure the voltage at the battery terminals and use whatever voltage at the alternator that is required to obtain good voltage at the. A healthy alternator is typically in the low to mid 14s as Paulster2 stated. Engine running the voltage will be from 135 to 147 volts.
If you have a good alternator you should be able to charge a flat battery to 80 percent capacity in roughly 2 hours. Remy 94125 New Alternator. An alternator needs between 138 and 142 volts to charge a 12-volt vehicle battery effectively.
Technically 16 volts is detected to be too high for an alternator voltage. Depending upon ambient temperature charging voltage generally varies between 148 and 135 volts.
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