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Normal Car Battery Voltage While Running. When the engine is running, this measurement should be 13.7 to 14.7 volts. You should measure right on the battery posts and then again on the cable terminals. When your car is running the cars alternator is charging the battery, this is why you should see a higher voltage. This voltage range means the battery is in good condition for starting the vehicle.
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Measure voltage between alternator frame and battery�s negative terminal. If is is lower on the terminals you have a bad connection usually caused by. Under that and the car installation and battery isn’t getting enough electric power. The rule of thumb that states 12.6 volts equals a fully charged battery and 12.2 volts means it is 25 percent charged, is starting to change with some modern batteries and charging systems. I noticed this occurs more during long trips. Some alternators are single wire(not counting the frame ground) and produce around 14.5 volts at their output terminal , assuming there�s not much voltage drop between there and the battery.
14.6 would be high normal, 13.5v would be acceptable battery charging voltage.
Some alternators are single wire(not counting the frame ground) and produce around 14.5 volts at their output terminal , assuming there�s not much voltage drop between there and the battery. Would help knowing what is the norm. It should be similar to the voltage at the alternator, which should be around 14.0v. This voltage range means the battery is in good condition for starting the vehicle. When running at a normal slow cruising engine rpm, the voltage across the battery terminals should stay over 14.3 volts even with full load, like lights, heater blower, and everything else, running. Put the multimeter in a safe place, especially if the car battery is under the hood.
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If the multimeter falls into the engine bay while the engine is running, it can damage or crush the digital multimeter. As others have posted, it can go up to 15v or even a bit more. 13.7 v is ok when engine running and alternator putting out charge. 13.5 volts is the bare minimum. There is a very big difference when a car battery drops even a small amount of voltage.
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Put the multimeter in a safe place, especially if the car battery is under the hood. I�ve attached an excerpt from the service manual which explains this feature. When car is running with accessories off, i am getting voltage of 13.78. Again, research suggest voltage should be upwards of 14.3 for most cars. With the engine off, you should get a reading of 12.6 volts.
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I’d say if its less than 13.7v when cold its not ideal, but be aware the voltage will reduce at the alternator warms up. I noticed this occurs more during long trips. If you don’t have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights. A 12 volt battery contains 6 x 2 volt cells but 12v is the nominal voltage. The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell is approximately 2.13v.
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That’s the normal process of how an alternator works. I noticed this occurs more during long trips. On the issue of parasitic drain, i measured the battery voltage last night and it was 12.34 at about 9:45 pm. Would help knowing what is the norm. Measure voltage between alternator frame and battery�s negative terminal.
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Fully charged car batteries usually measure at around 12.6 volts or above, with some instances of your car battery showing 13 volts. That’s the normal process of how an alternator works. 14.6 would be high normal, 13.5v would be acceptable battery charging voltage. This voltage range means the battery is in good condition for starting the vehicle. When the car is running once the vehicle is running, the alternator will kick in and take over the task of powering the car while also recharging the battery.
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If is is lower on the terminals you have a bad connection usually caused by. For mosts car a good test is to measure the voltage at the battery with the lights on and engine running. A 12 volt battery contains 6 x 2 volt cells but 12v is the nominal voltage. When car is running with accessories off, i am getting voltage of 13.78. You should measure right on the battery posts and then again on the cable terminals.
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As others have posted, it can go up to 15v or even a bit more. The ideal car battery voltage with the engine running is between 13.7 and 14.7v. More than about 1/10 volt says there�s a grounding issue. I was first very concerned since i saw the voltage meter go down to 12.6 volts while the engine is running. If the multimeter falls into the engine bay while the engine is running, it can damage or crush the digital multimeter.
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May not be true for this vehicle however. This voltage range means the battery is in good condition for starting the vehicle. In the meantime, i�ve been checking the voltage daily with a multimeter. Fully charged battery, perfect for fitment to vehicle. Anyone know what voltage should be pumped out by the alternator?
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You should measure right on the battery posts and then again on the cable terminals. As others have posted, it can go up to 15v or even a bit more. For mosts car a good test is to measure the voltage at the battery with the lights on and engine running. If is is lower on the terminals you have a bad connection usually caused by. Put the multimeter in a safe place, especially if the car battery is under the hood.
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I�ve attached an excerpt from the service manual which explains this feature. Fully charged automotive batteries should measure at 12.6 volts or above. I’d say if its less than 13.7v when cold its not ideal, but be aware the voltage will reduce at the alternator warms up. When the probes touch the terminals while the car is off and the battery is resting, the multimeter display should show a reading of 12.2 to 12.6 volts (full charge). As others have posted, it can go up to 15v or even a bit more.
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Completely agree that this is perfectly normal behavior. In addition, the voltage with the engine turned on is consistently 14.4 v or higher. For mosts car a good test is to measure the voltage at the battery with the lights on and engine running. When your car is running the cars alternator is charging the battery, this is why you should see a higher voltage. The indicated voltage is a function of the battery�s state of charge and loading at the time, and what the car�s electronics are doing to charge the battery.
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When fully charged, how many volts should a car battery have? The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell is approximately 2.13v. Completely agree that this is perfectly normal behavior. This voltage range means the battery is in good condition for starting the vehicle. A fully charged car battery has 12.6 volts.
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Much less than 14.2 at a fast idle is bad wiring, bad alternator or regulator, or a bad connection or fuse link. Under that and the car installation and battery isn’t getting enough electric power. 13.7 v is ok when engine running and alternator putting out charge. When your car is running the cars alternator is charging the battery, this is why you should see a higher voltage. The dealership reassured me that this is normal operation due to the electric power management feature.
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If ok, then with a known good battery and the engine running at 2000 rpm or more for two minutes, depending on the load and ambient temperature, the voltage should increase to. In the meantime, i�ve been checking the voltage daily with a multimeter. It outputs a higher voltage than the battery so that it charges the battery. Measure voltage between alternator frame and battery�s negative terminal. The results are, consistently, as follows:
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The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell is approximately 2.13v. If you don’t have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights. Anyone know what voltage should be pumped out by the alternator? When the engine is running, this measurement should be 13.7 to 14.7 volts. Much less than 14.2 at a fast idle is bad wiring, bad alternator or regulator, or a bad connection or fuse link.
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A faulty charging system will drain the battery while the car is running. If you have driven the vehicle for a while, and the battery voltage with the engine running is above 14.0 volts, shut down the engine and turn on the lights for 5 minutes, start the engine monitoring the voltage, it is warm and the voltage should not go below 9.6 if it does the battery is junk. If you don’t have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights. The indicated voltage is a function of the battery�s state of charge and loading at the time, and what the car�s electronics are doing to charge the battery. You should measure right on the battery posts and then again on the cable terminals.
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Measure voltage between alternator frame and battery�s negative terminal. If there is a dead or weak cell, normal charging voltage can’t be achieved on a battery with a bad cell. The rule of thumb that states 12.6 volts equals a fully charged battery and 12.2 volts means it is 25 percent charged, is starting to change with some modern batteries and charging systems. If you have driven the vehicle for a while, and the battery voltage with the engine running is above 14.0 volts, shut down the engine and turn on the lights for 5 minutes, start the engine monitoring the voltage, it is warm and the voltage should not go below 9.6 if it does the battery is junk. A 12 volt battery contains 6 x 2 volt cells but 12v is the nominal voltage.
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A 12 volt battery contains 6 x 2 volt cells but 12v is the nominal voltage. 12 volts is the standard automotive battery in today’s vehicle and each of the battery has 6 cells with a voltage of 2.1. Measuring your car battery’s voltage can be a great way to determine how charged your battery might be. If measured at this point, the battery reading you will get will be anywhere between 13.5 to 14.7 volts. A fully charged car battery has 12.6 volts.
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