Q: My car wouldn't start after battery was just replaced my car cd player is running after I turn the car off

asked by on

I just replaced the battery and my car wouldn't start the other day I turn the car off and the cd player starts spinning all by itself so do you think that is what is draining my car battery?

My car has 119000 miles.
My car has an automatic transmission.

Your CD player definitely should not be running after the key is off and out of the car. It will certainly drain your battery. So the good news is you can be reasonably certain about what is killing your battery. I would remove any CD’s from the player and see if it still spins with the key out of the car. If you need to go a step further, you will need to disconnect the power wire to the stereo. It is located at the back of the stereo and this will require some dash disassembly to access the rear of the radio.

You will want to disconnect the stereo overnight to see if the battery dies. A quicker more accurate way of testing for a draw, which is what this is called, is to use an amp meter at the battery to confirm the stereo is the source of the draw. Most multimeters have amp settings that can be used up to a ten amp draw. You will need to connect the leads of the multimeter inline with the positive battery cable. Do not turn the key on while the multimeter is inline with the battery. The current will blow the fuse in the multimeter then you won’t be able to complete the test. Also, you will need to wait somewhere between ten minutes and an hour for all the modules in the car to go to sleep. Modules that are on will draw current until they go to sleep. You are looking for a draw of more than a half of an amp continuous.

With the multimeter connected, disconnect the radio connector and see if the draw goes away. You will see this reflected in the multimeter amperage reading. This draw test can be used to locate any draw that may be occurring. If you find the radio is not the culprit, you should then begin removing fused one at a time to see what is causing the draw. When the draw goes away after removing a fuse, something on that fused circuit is causing the draw.From there you will need to study a wiring diagram to see what is on that circuit.

Of course, all this takes an understanding of electricity to do these test. If you should need assistance with this, I recommend the following inspection; Battery is dead inspection from a certified technician from YourMechanic.

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

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. My car wouldn't start after battery was just replaced my car cd player is running after I turn the car off

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: My car system beeped with the low coolant warning light and went to cold and then it completely shut off

Hello. If the coolant was low enough and if the engine started to get hot then it will shut down. Hopefully the engine turned off before any damage occurred. If the coolant was that low then there is a leak....

Q: Q: car is not cranking, wont start.

Usually when the car will not crank but has power to other systems, the starter is a possible cause of this issue. Considering that you have had the vehicle for 9 years and never changed the battery, it is also...

Q: Takes two key turns before car starts

Hello there, thank you for asking about your 1996 Oldsmobile LSS. A prolonged start can be caused by problems with fuel delivery or air metering. Improper readings from failed sensors can cause an improper fuel mixture and cause the vehicle...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...