Fixing Car Battery Drain- In Your Car-Could be many things

Fixing Car Battery Drain

Scotty Kilmer, mechanic for the last 46 years, shows how you can find out what’s draining the electricity out of your car’s battery. And, If you like my car help, be sure to watch my live car talk show every Saturday morning at 10 AM CST on YouTube.

One of the worst thing that can happen to a motorist is when you jump into your car, and it won’t start. Is your battery dead?

If you are in a rush, then it would be best to jump start the car. Your car can be started with a set of jump leads. The leads should be connected to a friend or neighbours car. The other option is to charge the battery up with a portable battery charger. After a few minutes, this will give you enough power to start the car and get you to work.

It could be that you left your lights on, and this drained the battery. However, the same happens the day after. The battery is run down again, and the engine won’t crank over.

A car battery can become flat and run down for many reasons. One of the main reasons is that the lights could be left on accidently. Another problem could include the interior lights left on. Other accessories can also drain your battery if left on.

In my opinion, though, the most common problem is that the alternator has not charged the battery. There could also be a sticking relay or a module that is not shutting down, causing the car to go into “sleep mode”.

Fixing Car Battery Drain

If the alternator is tested and found to be good, then it could be that you just need a new battery. The driver can check alternator problems. Just turn your headlights on. They should be a normal brightness. If when you turn the battery over, the headlights are dimming or do not come on at all, you need to check battery voltage and charging output.

Other problems could be a bad starter relay or solenoid. Faulty or poor wiring in the starter area could also be the problem.

To check this, you will need a voltmeter select the 12-volt setting and connect the red wire to the battery positive and the black wire to the negative battery terminal. The reading should be 12.6 for a fully charged battery. As the voltage drops then, the battery condition has deteriorated.

Battery Voltage and State of Charge:


12.66v . . . . . . . . . . 100%

12.45v . . . . . . . . . . 75%

12.24v . . . . . . . . . . 50%

12.06v . . . . . . . . . . 25%

11.89v . . . . . . . . . . 0%


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