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.

A: Yes, your amp could be staying on. Feel it ...

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

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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: How can I tell if the water pump has been replaced as the previous owner claimed?

Hi, thanks for your question. The best thing to get when purchasing a car are service records. If the seller doesn't have them in hand, you can go to the shop that did the work and they will have records...

Q: just noticed that it is overheating--no water dripping and the temperature gauge is normal. Not sure if it is the thermostat.

Hi there: There are multiple issues that could be causing this overheating problem on your 2003 Windstar. First, you might have a thermostat issue that is not allowing coolant to flow through the motor as it should, second could be...

Q: it set for almost 8 weeks I started it, it started no problem it was low on gas then it ran out.I put gas in didn't start

With any repair, I highly recommend a thorough diagnosis before replacing any parts. In this case, you need to check for spark, fuel pressure, injector pulse and camshaft timing. You need a spark tester to check for spark, a noid...

Related articles

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...
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.