How Long Can a Car Enging Continue to Run Without an Alternator
The answer to this question depends on how you use your vehicle and at what speed. You can drive a car or a truck for about one mile before the battery dies if it's started without an alternator.
If you could attach jumper cables to start another car and then transfer its functioning alternator to your dead vehicle, it would work indefinitely so long as you never turn off the ignition. A running automobile with a bad alternator can be driven without damaging the battery or causing any undue wear on the charging system.
However, the battery only has so many charge/discharge cycles in its life. So you're gradually wearing out the battery by constantly running it down to nothing and then recharging it. Eventually, you'll need a replacement.
What is the primary function of a car alternator?
A car alternator is a device that converts mechanical energy to electrical energy in alternating current. The electricity produced is fed via the vehicle's electrical system into the battery and powers electrical components such as radio and lights and accessories like fridges and power windows.
The primary function of a car alternator is to produce the alternating current. In addition, it supplies electrical energy to the battery and necessary components in a vehicle.
The alternator generates electrical energy, and the battery sores it. This stored power supplies the requirement of components such as lights and fans.
How do I know that my car alternator is failed?
Alternators in modern cars are usually very reliable; however, they can and do fail from time to time. If your car won't start when you turn the key, there is a good chance the problem could be an alternator. Fortunately, this is easy to troubleshoot yourself. First, disconnect the wire from the positive battery terminal (make sure the car is turned off). Then, if the car starts, you have found the problem.
If your alternator has failed, you will experience one or more of the following symptoms: Your battery light comes on when starting your car. The battery may be low, but not enough to cause a failure. When running accessories turn off (radio dims) the car won't start.
If your car is experiencing any of these symptoms, you should immediately seek a qualified automotive technician's assistance.
What to do if my car alternator fails?
Well, the obvious thing to do is call a tow truck and get your car towed to a garage or auto shop that can either fix it for you if they know how; or tell you that you need to leave it with them and let them take at least one day off of work to figure out what's wrong and fix it. As simple as that.
But, if your car broke down in an area where there is nothing, and you don't have a cell phone signal to call anyone, then let's hope that you at least know how to replace this broken alternator yourself! At least we can agree on one thing: it must be done ASAP.
First of all, you have to find a good, safe place where your car will not be in danger of being hit by another vehicle. There is a chance that the car will need to stay in that same position for several hours while you complete the replacement process so pick a safe spot near your broken down car (but not too close!).
Once you decide where the car needs to stay for several hours, pop open your hood and disconnect the negative terminal of your battery. It will, in turn, kill every system that runs on electricity inside your car so take note of this. It is essential not to touch any metal part of your car with both hands until the electric power has been turned off. Otherwise, you risk getting electrocuted!
Disconnect the alternator's negative terminal and start unbolting it from its place. Once you have removed the old unit, connect your car battery's positive terminal and then re-install your old alternator in the same position where it was before. Now your car should start, and you can take it to a garage for further inspection and, if necessary, repairs.
great to know | 28 Dec 2021 
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Source: https://expertpickhub.com/batteries/car-battery-lasts-without-alternator/
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