My Car Dies After Replacing the Battery and Alternator: What is Wrong?

My Car Dies After Replacing the Battery and Alternator: What is Wrong?

If your car dies after replacing the battery and alternator, you may be wondering what the problem could be. Replacing these two components is a common task for car owners, so it’s natural to assume that the issue must lie elsewhere if they still don’t work properly.

There could be a problem with the electrical system. One common problem is a faulty wiring harness. This can cause problems with the charging system and make the car dead. Maybe the alternator fuse is blown or your new battery has some issues.

Let’s explore some possible causes of this issue and I’ll offer some tips on how to troubleshoot it.

Table of Contents

Replaced alternator and battery car still die; Reasons.

There could be a few different reasons why your car is still dying after you have replaced the alternator and battery.

Short in the wiring

One reason may be that there is still something wrong with the electrical system, such as a short in the wiring. If this is the case, you will need to have a professional take a look at your car and determine where the problem is.

Bad ground connection

Another possibility is that there is a bad ground connection somewhere in the car. This can be tricky to find and fix.

Loose battery terminal

A loose battery terminal can also cause your car to die. This is an easy fix- simply tighten the terminal until it is snug.

a problem in the engine

Another possibility is that there is something wrong with the car’s engine, such as low compression or a leaky head gasket.

Stop-Start Not Ready Battery Charging; Must Read.

Blown Alternator Fuse

To find if the alternator fuse is blown, first check the fuse box for a blown fuse. If the fuse is not blown, then check the alternator itself for a loose connection.

If the problem is with the alternator fuse, then replace it with a new one. If the problem is with the alternator, then you will need to take it in for repairs.

Vehicle Will Not Start After Alternator, Battery Replacement

A problem in the Alternator voltage regulator

The voltage regulator of the alternator is what controls the electricity in your car. If it is not working properly, then it can cause the battery to not charge. This will cause your car to die.

There are a few things that you can do to troubleshoot this problem on your own:

First, check the connection between the battery and the voltage regulator. If it is loose, then this can cause the voltage regulator to not work properly.

Second, check the fuses that are associated with the alternator and the battery. If any of them are blown, then you will need to replace them.

Third, test the resistance of the voltage regulator. This can be done with a multimeter. If the resistance is not within the correct range, then you will need to replace the voltage regulator.

If you are still having problems after doing all of these things, then you may need to take your car to a mechanic and have them look at it.

Where To Ground Your Car Battery? – Engine Or Frame

The new battery is bad

Maybe the new battery you bought is bad. It happens. Take it back and get a new one.

Sometimes your car accessories cause your battery to die. Your car’s Bluetooth a\kit, horns, and other things that use your car’s electric system can drain your battery quickly if not maintained properly.

Damaged Serpentine Belt Causing Alternator Not Charging Battery

If you’ve been experiencing car problems and have replaced the alternator and battery but your car is still dying, it’s possible that the serpentine belt is to blame.

The serpentine belt is responsible for powering all of the accessories on your car – including the alternator. If this belt becomes damaged or snaps, it can prevent the alternator from charging the battery.

So, if your car still dies after replacing the alternator and battery it’s mostly because of the above reasons we discussed. If you are still having troubles or don’t know how to properly troubleshoot and fix the problem it’s best to contact an experienced mechanic.


Can a bad battery cause alternator failure?

Yes, a bad battery can cause alternator failure. When the battery is weak, it can’t provide enough power to the alternator. This causes the alternator to work harder and eventually fail. If your car has been having trouble starting or if the battery seems to be losing its charge more quickly than usual, have it tested and replaced if necessary.

Do you have to replace the battery when replacing the alternator?

It’s not necessary to replace the battery when replacing the alternator, but it’s a good idea to do so. The battery is what provides power to start the car, and if it’s not in good condition, it could cause problems. When you have the alternator replaced, have the mechanic test the battery as well.

Can a bad alternator ruin a new battery?

Yes, a bad alternator can ruin a new battery. If the alternator isn’t charging the battery properly, it can damage the battery and eventually cause it to die.

Why would a car not start if the battery and alternator are good?

A car not starting due to a battery and alternator both being good would be an extremely rare occurrence.
However, it can happen and means there is likely another issue with the vehicle. One possible cause of this may be that a fuse has blown or that the starter failed.

Why is my car dying after I changed the alternator?

Most likely there are other problems with the car and this change just started to reveal them. There is a chance that it could be an electrical or computer problem rather than the alternator itself, but replacing the alternator will allow you to eliminate electrical or computer troubles as a potential cause of your car’s engine dying.

Can a blown fuse drain a car battery?

Sometimes. A blown fuse can cause other components of your electrical system to malfunction so eventually the car battery could become drained, but a blown fuse definitely does not immediately drain a car battery.
If the alternator goes out, that will indeed drain your battery, and the light on your dashboard will go from green to red letting you know it’s time for charging.

How can you tell if your alternator is bad?

The best way to tell if your alternator is bad is to check the voltage at the battery with a voltmeter while the engine is running. If it’s lower than 14 volts, the alternator is probably not charging the battery and needs to be replaced.

Can you jump-start a car with a bad alternator?

Yes, you can jump-start a car with a bad alternator, but it will only be temporary. The alternator is responsible for generating power for the car’s electrical system, so if it’s bad, the battery will eventually die.

Meta Description: If you’ve replaced your car’s battery and alternator and it still dies, there could be a problem with the electrical system. Learn more here.

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