Skip the auto shop - Our mechanics make house calls

Q: Parasitic load on battery.

asked by on

The battery drains while my car is running.

Cars basically use the battery at start up. Once the vehicle is running the alternator takes over and provides the car with the electricity it needs to run. If the alternator stops producing the electricity the car needs, the car simply starts taking it from the battery. The car will continue to run until it drains the battery then it will turn off. A technician will be able to test your charging system and determine if the alternator is the culprit.

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

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: Battery discharging while stopped, electrical devices were temporarily switched off.

The first thing to do with a draw is to check and make sure nothing is on that can be turned on by a human. Some common sources are interior lights, exterior lights, after market stereo systems or other after...

Q: What do I need to replace? My car was in an accident.

The first step is to remove the radiator and inspect it. It is very likely that it has been damaged. Once you have the radiator and the fan out of the way, you can inspect the other components involved. The...

Q: Cranking noises when I am turning on my car.

The problem may be the replacement starter itself or the transmission flex plate the starter drives to start the engine. If there was damage to the gear on the old starter, some of that damage may have transferred to the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.