Why would my battery light come on after replacing alternator?
Similarly, there are two things that generally cause a battery warning after an alternator replacement. The most common is, again, a loose connection either with the control plug (aka “relay” plug-in), charging line connection, or the ground.
Why is my battery light on if I just got a new battery?
Battery warning lights are an indication that you have battery charging problems. If the battery warning light is still on despite replacing it with a new one only indicates one thing, you have an alternator problem. The warning light will typically go off after solving the problem or replacing the battery.
Can a new alternator drain a battery?
An automotive alternator is a device that converts power from the engine into electricity, which is used to charge the car’s battery. In some cases, however, the alternator can actually drain the battery, causing significant problems.
What should the charge voltage be on an alternator?
Turn on the high beams for 10 seconds and then turn them off. Measure battery voltage across the battery posts with your DMM. You should get between 12.4 and 12.6V. This means your battery is fully charged. If you get a reading below 12.4V, charge the battery before continuing. 5b. Measure the Charging System’s No-Load Voltage
How do I know if it’s the battery or the alternator?
Both of these car parts control your electrical system. However, your alternator charges your battery while your battery supplies power to your car. The failures of a battery are sudden, while failures of a failing alternator are slow. Always check your battery first, it can generally tell you which of these two is the culprit.
What happens if the alternator is not working?
The alternator charges your battery while you drive. If your alternator fails, your battery doesn’t charge and eventually dies. How long will a car run without an alternator? If your alternator isn’t working, your car can barely do more than start before you begin losing power.
How does an alternator and battery work together?
Anything less than that and your car isn’t even able to start. Both of these car parts control your electrical system. However, your alternator charges your battery while your battery supplies power to your car. The failures of a battery are sudden, while failures of a failing alternator are slow.