Q: Why is the power from my battery not coming through? It was fine yesterday.

asked by on

After I put-in a new battery my car would not start when I turned the key, but the lights and radio still worked. I found out it was a faulty security system and all I had to do was reset it. NOW, the power from the battery initially works, but when I try to restart the car after having it on accessories, ALL power from the battery stops. Not even the lights turn on. I unplugged and re-plugged the battery and that seemed to do the trick but not permanently. Is it the battery cables that need replacing?

My car has 110915 miles.
My car has a manual transmission.

When you experience a complete failure of power in the fashion you have described, it is most frequently a bad connection at the battery. Either the terminals or one of the cables has an issue. It’s important to understand that just because a wire is touching a power source, does not mean it is a good connection. It is very common for a connection to exist at a battery post when low current is in use but for that same connection to fail when a higher current is required for the starter. Explaining this phenomenon would be to explain electrical theory and this isn’t the best place for such an explanation.

Some of the things to look for are replacement cable ends, a loose battery connection at the positive or negative posts, and loose or dirty connections at the starter are the typical culprits. Electricity likes clean metal. If it has a surface rust or other forms of corrosion, even if the connection is tight, it can and often will not allow current to flow.

Grab all the connections and pull on them. You should not be able to move them with a reasonable amount of force. If the battery cable ends have a surface film of any sort on them, clean them with sand paper and some battery cleaner from your local auto parts store. If you don’t have any luck with the information I have given you, book an appointment with us. A certified technician can come diagnose the issue with your battery and make the necessary repairs to you car.

Good luck.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Why is the power from my battery not coming through? It was fine yesterday.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: When driving my 2004 Infiniti FX35 my slip and VDC lights come on and my car comes to a stop.

Hello. If these lights are coming on while driving then the vehicles traction and stability systems are kicking in due to a problem that is seen. This can be caused by a bad wheel speed sensor or by an issue...

Q: When reversing after car sits overnight, there is a loud clunking sound coming from left rear. Seems to stop once car warms up. Ca

Hi Corinne. Thanks for contacting us today. Sometimes, this type of problem is an indication of a wheel bearing that is starting to wear. As the wheel spins, it will build-up heat and the noise can go away. However, over...

Q: Q: Code P0420

Code P0420 relates to an issue with the catalytic converter performing at a less than optimum level. The catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When the catalytic...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.