Question: Do I Need A New Battery After Replacing Alternator?

Why is my battery light on after changing alternator?

The most common is, again, a loose connection either with the control plug (aka “relay” plug-in), charging line connection, or the ground.

The other is a blown fuse or defective connector or relay, which could have been broken or shorted when the alternator was installed or on the first start-up after its installation..

How do you know if it’s your battery or alternator?

If the engine starts but dies immediately, your alternator probably isn’t keeping your battery charged. If a jump starts and keeps your car running, but the car can’t start again off of its own power, a dead battery is likely your answer.

What are the signs your alternator is going out?

However, a very simple way to check if the alternator is working is to run the car and disconnect the positive terminal of the battery. If the vehicle stops running, then you probably have a bad alternator. You can also examine your interior and dashboard lights.

Can a bad alternator ruin a new battery?

Yes. The alternator can have a bad diode which allows A/C to flow to the battery. It does not take long for A/C to damage battery cells. Likewise, a bad battery will kill an alternator.

How long will a brand new battery last without an alternator?

Essentially though if your alternator gives out, I’d say you have anywhere between 10-30mins before you’re stranded with a petrol engine.

How do you tell if it’s your battery or alternator?

An illuminated dashboard light can indicate a problem with an automobile charging system. However, a very simple way to check if the alternator is working is to run the car and disconnect the positive terminal of the battery. If the vehicle stops running, then you probably have a bad alternator.

How far can I drive without alternator?

25 miles should be fine. Theoretically, on an older car, you can drive forever once the engine is running, you’ll just be without any electrical amenities in the vehicle. Newer cars are much more reliant on the battery/charging system, and many won’t even stay running with a dead battery.

Will a car run with a bad alternator?

The short answer is yes a car can be driven short distances with a faulty alternator. If an alternator is giving a low charge it will but a load on the engine trying to ineffectually charge a battery and the battery will slowly die as the alternator gets weaker and weaker and cannot sufficiently recharge the batter.

How long can you drive with a bad alternator?

Starting with a fully charged battery you will probably get 100 Miles before it wears down too far. It also depends greatly on not running headlights or running lights. If you have a car that always runs with the headlights on, and if your battery is several years old, 50 miles might be a better estimate.