Skip the auto shop - Our mechanics make house calls

Q: New battery died charged

asked by on

I put a new battery and alternator in my van and it ran fine all day. But the next day the battery was dead. I charged the battery and it worked. But why would my new battery go dead with my new alternator?

A: It is possible that you may have a large pa...

It is possible that you may have a large parasitic draw or the new battery was faulty. A parasitic draw test should be set up if the battery passes a load test. The alternator should also undergo a charging system test. A draw above 80 mA is generally considered excessive and the faulty circuit corrected. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will have the equipment and expertise to diagnose the charging issue.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: My alternator went out so I replaced it and also had put in new battery. Now it shuts off once I put it in drive.

Hi there. It would seem unusual, after replacing your vehicle alternator and battery, it would stall when put into drive. There is a possibility, the ECM (Engine Control Module) needs to relearn idle speed. Many vehicle engine computers have adaptive...

Q: I'm wanting to know if I can fit the dual exhaust muffler from a Nissan Bluebird 92 onto a 94 Impreza Wagon CS Cheers.

Hi there. It is possible for any kind of muffler to install onto your vehicle. This will determine if there is room for the muffler and if the pipe size is the same or not. If the pipe is the...

Q: Car won't start after being parked

When the key is turned and nothing happens could mean several things; you have a bad battery (most common), the switch is bad, or the starter is not working. If you hear a click when you turn the key and...

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...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...