Q: Battery drain, brake warning light on

asked by on

The battery in my car keeps getting drained. I had the battery tested and it checks out fine. Also, it is relatively new, about ten months old. Also, the dashboard shows the brake warnning light illuminated occasionally. When the light comes on, my battery power drops to low. What should I do?

Hello. If the battery is draining as the vehicle sits then most of the time this is caused by a failing ignition switch. I have had a lot of these fail on this vehicle.

I usually start by doing a voltage drop test of the switch to see if it is failing. If it is fine then the issue may be a sticking relay or a module problem. At that point I would perform a parasitic draw test on the battery and isolate each circuit while I try to find the one that is not turning off as it should.

If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to you home or office to diagnose you draining battery and repair this.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Battery drain, brake warning light on

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: What does the push button warning mean?

If your car has a continuously variable transmission (CVT) and a push button start, you may see the push warning show up on your vehicle information display. The image display shows the word “Push” and the outline of the start...

Q: Car shakes when driving over 40mph.

Hi There, Shaking at high speeds is often times related to tires that may be out of balance, low on air, potentially a badly aligned front end or failing suspension components or ball joints. When any of these things are...

Q: Guage, fuel and thermostat needles moving very fast

You may have a connection that is getting corroded and is causing intermittent connection problems. If the problem happens again then have the connection to the dashboard cluster disconnected and then add dielectric lube to connection and pins. At the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...