Battery keeps draining

Good morning,

You never ever disconnect the battery while the engine is running. That tests nothing and can cause damage to the modules. The modules and relays need battery voltage to work and taking away the power will not allow the systems to operate.

The reason it stays running for a little time is the magnets in the alternator are charged and when that charge goes away, it will stop.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

https://www.2carpros.com/articles/car-battery-dead-overnight

You need to start with testing the alternator. I attached a guide for you to follow for testing.

As far as the draining down overnight, I attached another guide for testing for a parasitic draw.

Roy

My battery keeps on draining every time, I tested the battery voltage while the engine is running and it only reads 12 volts, indicating that the alternator is not working. I disconnect the battery cable for a few seconds and the engine continues to run and the voltmeter reads 14 volts. However when reconnect it, it goes to 12 volts.
What could be the possible problem here?

Thank you....

Good morning,

I attached a guide for you to follow for checking the charging system.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

It does sound like the alternator is not working at all.

https://www.2carpros.com/articles/how-to-replace-an-alternator

As I stated before, never remove the battery cable while the engine is running as you can damage the modules and it tests nothing.

Roy

Thank you very much Sir..

You are welcome.

Always glad to help.

Roy