Skip the auto shop - Our mechanics make house calls

Q: Can't find a parasitic drain?

asked by on

I have went through the fuses looking for where the drain is coming from, the only thing I haven't checked is the amp. But I rarely tour stereo on, could this still be the culprit?

My car has 152400 miles.
My car has an automatic transmission.

Yes, your amp could be staying on. Feel it and see if it’s warm. Disconnect it to confirm. Using a low amp probe (amp clamp) around the battery cable is the easiest, most repeatable method to measure battery drain. Measure the B+ wire at the alternator as well. Feel relays for warmth and key out of the ignition while doing this. Remember it can take 10-30 minutes after running for all modules to go to sleep. If you pull a fuse then put it back it can wake up a control module. You have to leave it out and move on with testing. Instrument cluster and rear wiper motors are a possibility, too. There is a lot of electrical content in your car, so you may want to double check the fuses. You’ll also want to verify whether the battery really is good! If you are still having trouble, you can always get a certified technician from YourMechanic to come to your car’s location to diagnose your battery and let you know what needs to be fixed.

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
  1. Home
  2. Questions
  3. Can't find a parasitic drain?

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: Throttle Body

Hi There, As you might know, the throttle body is the component in your vehicle's intake system that controls the mixture of fuel and air intake into the engine. There are various other components that also work in conjunction with...

Q: 2003 grand marquis tire feel like they go in when i make a ture

Hi there. I'm not quite certain what you are referring in regards to "having the tire go in"? There are many individual components that make up the front suspension that could be loose or damaged; which tends to cause front...

Q: The car won't start, battery and starter replaced

Thanks for writing in about your 1997 Lexus SC300. Power at the starter needs to be checked along with all of the connections. When checking connections to the starter, the battery will need to be disconnected to prevent a dangerous...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.