Q: Car experiencing battery drainage

asked by on

My car keeps dying during the day. It's usually fine during mid-day, and then by evening it's dead. I've hooked up a test light and pulled each fuse, but the only one we so much as get a flicker for is the IOD Sense1 and 2 fuses. Otherwise the light doesn't even dim. I've also hooked it up and checked each fuse to make sure they were in good condition. I pulled each fuse and checked the output and sit at a steady 12-12.5 volts per the multimeter. I've checked every light source. I had the alternator checked. We don't have a switched out alarm that seems to give some people trouble. There's no other sign of a problem except that we obviously have a drain somewhere, but we can't find it. Considering that I individually pulled each fuse, and it must be an electrical problem, shouldn't it have read with the test light? Any ideas?

A: You may just have a <a href='https://www.yo...

You may just have a bad battery. I suggest you test the battery first before performing any further testing. If it tests OK, you can test for parasitic draw (which is what I think you were attempting to do) by placing a digital multimeter, set to amps, in line with the battery negative cable. Generally, on modern vehicles, the draw should read less than 30 milliamps with all of the loads off.

If it is determined that there is a drain, each fuse should be removed until the reading drops on the meter. When that happens, you'll know you've found the problem circuit. I suggest you have a trained professional, such as one from YourMechanic, diagnose your battery drainage issue and repair this problem.

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: Car shutting off

Hello, thanks for writing in. It sounds like you have a few different issues going on. It sounds like you know what is going on with the other issues but as for the new problem the fuses need to be...

Q: Power steering whines after going highway speeds

I have encountered this issue time and time again; it can be a bit of a challenge to resolve. Chrysler has a power steering cooler update which could resolve your issue. However, you could have an issue with the power...

Q: Is my clutch safety switch broken?

Hello. These 2 problems should not be related. A clutch safety switch stuck in the "pedal depressed position" (or a switch that has been unplugged and a wire connected across the 2 terminals) will allow starting without depressing the clutch....

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 Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.