What Should Car Battery Voltage Be At Idle
What Should Car Battery Voltage Be At Idle. If it’s less you may have a weak or dead alternator which will in turn kill the battery. In an ideal situation, the voltage will read somewhere close to 14.4 volts but it will stay at this number and won’t continually fluctuate.
I have a 1996 ford f150 that when the weather is cold or damp the voltage runs really low almost to the point of stalling the truck. At idle, most charging systems will produce 13.8 to 14.3 volts with no lights or accessories on (although some may charge at a slightly higher voltage depending on temperature, engine rpm, type of battery, and the battery's state of charge). In older batteries is where we are likely to see more dramatic volt dropping overnight.
It Is Essential That You Let Your Car Sit Idle For A Night And Measure The “Resting Voltage” To Get An Accurate Voltage Measurement.
Still, you must know that there are alternative methods you can use. When a tps goes bad, then the car’s throttle body won’t function properly. Basically it is sitting idle at this point.
The Problem Is That The Alternator At Engine Idle Is Barely Able To Supply Any Current So The Voltage Will Be Lower Than You Might Wish.
If everything is ok the battery voltage should be around 12.2 to 12.7 volts, depending on the condition of the battery. Because of this, the multimeter should read between 13.8 and 14.5 volts when the engine is at idle. 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.
As Mentioned Above Cold Weather Needs To Be Considered As This Will Decrease The Voltage And Increase The Amount Of Power To Turn Over A Cold Engine.
If the number is lower than 14.4 but it is steady and not fluctuating, then your alternator is working absolutely fine: If it’s less you may have a weak or dead alternator which will in turn kill the battery. When the engine is running, this measurement should be 13.7 to 14.7 volts.
If The Electrical Load Is More Than The Output Of The Alternator;
The voltage is going to change with the charge of the battery, speed of the motor, load on the electrical system, etc. With a battery and alternator in good condition it might be as high as 14 volts. Additionally, once the engine is running, the battery should be receiving a charge from the alternator.
If It Falls Outside Of This Range, Get Your Alternator Checked.
If you have a voltage test meter, start by measuring the voltage at the battery, it should be about 12.5 volts. During starting a healthy car battery voltage should be 10v or higher. Note that this should be the reading when it has been fully charged but not in use.
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