Skip the auto shop - Our mechanics make house calls

Q: Changed battery twice in 2 weeks, I go to turn on and car is completely dead not even the lights work, what could it be? 2000 Acura TL

asked by on

I just got my car back friday after having the transmission fixed and noticed it making weird sounds like its idling weird and last week battery was completely dead not even lights worked and now again today I went to turn on the car and nothing! no lights the locks didn't even work and I didnt drive it all weekend. Why would it keep dying like that?

My car has 200000 miles.
My car has an automatic transmission.

Hi there - a repeating "dead battery" scenario has a couple of possibilities. One possibility is a bad alternator that is not charging properly. With the engine running, the system voltage should be close to 14 volts if the alternator is charging correctly. The second possibility is that something is draining the battery when the car is turned off. This problem can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain (likely less than 1 amp), then, one at a time, remove each fuse, check to see if the current drain has dropped to near 0, then reinsert the fuse. This process should identify the faulty circuit in most cases. A professional mechanic, like YourMechanic, can perform this diagnostic procedure for you, and replace/repair the failing component.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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!
  • Home
  • Questions
  • Changed battery twice in 2 weeks, I go to turn on and car is completely dead not even the lights work, what could it be? 2000 Acura TL

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: Why car cranks but wont start after over heating

Hello, It sounds like you may still have a leak between the cylinder head gasket and the cylinder head allowing coolant to leak into the oil passages and cylinders. A blown head gasket may cause a number of different symptoms....

Q: Idk

Hello, thank you for writing in. When a vehicle has alternator issues, the entire car is forced to run off of the battery. As you can imagine, this stresses out the battery and can cause it to prematurely fail. Start...

Q: Turned a corner and must have accelerated too fast

It sounds like you broke a CV Joint. The CV joint is a ball and groove affair that allows the axles to transmit power to the front wheels. If it fails, it usually happens when you are in a sharp...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...