Updated at: 12-03-2022 - By: micdot

Most drivers find the experience of a dead battery to be unsettling. It takes a lot of time and effort to jump-start your car. However, you were unfortunate enough to end up with a defective alternator. We’ll now discuss how to jump-start a car with a faulty alternator. If the alternator fails, can you still jumpstart the vehicle? You very certainly can. When your car’s battery dies, the first thing you should try is to jumpstart it with a faulty alternator.

A bad alternator jumpstart is exactly what we’ll be discussing today. A dead battery is an unavoidable situation, and you must be prepared for it. This is very helpful to all drivers. So, let’s get this started.

How Do You Jump Start a Car With a Bad Alternator?

Even worse than having to jumpstart your car is having a bad alternator because the alternator maintains the charge of your vehicle’s battery. The ability to jumpstart an automobile will be greatly diminished if you are working with a faulty alternator.

Even if your alternator fails, you can still use a jumper cable to get your car started. It is possible to jumpstart a car with a bad alternator if you follow these simple procedures. So, without further ado, here we go.

1. Find A Car With A Good Battery

A good battery is essential for jump-starting a vehicle. You can’t jumpstart a car if the battery isn’t good. To get your car going again, find someone with a reliable car battery to help you out. Passersby may be able to assist you in your time of need. However, a well functioning and fully charged automobile battery is an absolute necessity. It’s time to jump-start that dead battery, and the only way to do that is with the help of another battery.

2. You Need To Connect The Jumper Cables

You will need to connect the jumper wires if you are fortunate enough to find a kind stranger with good and fully charged car batteries to assist you. To begin, attach the red clamp to the positive terminal of the dead battery. Locate the second red clamp and attach it to the positive terminal of the good battery with the positive wire.

Once you’ve located the lone black clamp, you’ll need to attach it to the good battery negative terminal using a wire. An unpainted metal element in the engine bay should be attached to the second black clamp, which should be connected to a dead battery in the car as well.

3. You Need To Run The Car With A Good Engine For Three To Four Minutes

Running the engine for three to four minutes with a good battery may be necessary before jumping the automobile. Before you start the engine, make sure the jumper cables are already attached.

You can now start your automobile with a dead battery after around three to four minutes. Even if you hear the engine cranking, if the vehicle won’t start after three minutes, try again.

4. You Need To Turn Off The Accessories

Turning off every single accessory is essential. Among other things, there is a phone charger, a heating system, a CD player, an air conditioner, and a GPS. The main goal here is to disconnect all of your vehicle’s accessories from the battery. Having a spare battery in your automobile is a necessity. As a result, your headlights and other lighting systems will also use up energy.

5. Hurriedly Get Yourself To A Mechanic

After you’ve successfully performed a jumpstart on your vehicle, you’ll want to get it to a mechanic as soon as possible. If your car starts, it does not indicate that it will continue to do so. You don’t want to have to jumpstart your car a second time, so get to a repair as soon as possible.

Is It Bad For a Car to Jumpstart It With a Bad Alternator?

When an alternator fails, it’s possible to jump start the vehicle. With a bad alternator, the first thing you need to do is jump start your car. If you find yourself in a situation where you have a dead battery, the first thing you should do is jumpstart the vehicle. You’ll be stranded if you have a dead battery and a faulty alternator. Getting stranded in a remote region is more risky than trying to jumpstart your car with a faulty alternator since it puts you in danger of becoming lost. So, no, starting your automobile with a damaged alternator isn’t a bad idea.

How Long Will a Battery Last With a Bad Alternator?

This is a difficult question for which there is no single solution. There are several variables that affect the life span of a car battery with a defective alternator. As a result, the time required will differ depending on the vehicle.

The quantity of gadgets in your car, the engine, the brand of your car, how new it is, and many other factors might affect the battery life of a car with a defective alternator… Accessories, headlights, and other things that draw power from your car’s battery are also important. Additionally, the state of the car battery is a consideration. The battery in your automobile, especially if it’s old and in need of replacement, can be quickly depleted. It’s difficult to estimate how long it will take because so many variables come into play.

What Are Signs of a Bad Alternator?

To determine if your alternator is malfunctioning, there are numerous indicators you can look for. As soon as your car begins, if your warning light comes on, you’ve hit the first of these two points. If your headlights don’t shine as bright or dim as they used to, you may have a faulty alternator. Flickering dashboard lights and a malfunctioning speedometer are almost always the result of an alternator problem. These signs and symptoms are very obvious. As soon as you notice a problem, make an appointment to get your vehicle’s alternator looked out. Batteries are charged by the alternator, which is located in the vehicle’s engine compartment A bad alternator means a bad car battery, so check both before you go out and buy a new one.


To summarize, if your car’s battery dies, the first thing you should do is jumpstart it with a working alternator. You can start a car with a faulty alternator by using a jumper cable. You must adhere to the procedures outlined above. It is imperative that you take your vehicle to a repair right away if the activity is effective.