New battery still gives a poor voltage when driving it gi...

Q: New battery still gives a poor voltage when driving it gives the proper voltage.

asked by on November 10, 2017

My battery went out and I now got the new one in my truck, When I start the car it’s on like 10 volts then it’s doest move until I start to drive and it goes up to its regular voltage.. I checked to see with my bad battery. If the it could be the alternativer So I jumped the car and the took the cable off the car stayed running. So I know it’s not the alternater. What could this be.

My car has 28800 miles.
My car has an automatic transmission.

The test you performed doesn’t really tell the whole story. The alternator may be charging, but not up to capacity. To be sure you need the equipment to load test the charging system and see if the alternator output is up to specifications. It could also be that you have an electrical leak. Some part of the car’s systems might not be turning off completely when you shut off the car so the battery has a slow drain when it is parked. Checking for that has gotten complicated with cars built since 2000 so you might need to leave that up to a professional. To get a professional you can contact YourMechanic. They can send a technician to your home or office to check out your battery and charging system and let you know what it will take to fix it.

Was this answer helpful?
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

Bad thermostat causing radiator leak.

Just to be informative the radiator and the overflow tank are two separate parts that both store coolant and if one is leaking the other is not leaking. Also a bad thermostat will not cause a radiator or an overflow...

My Chevr HHR (2006) has milky oil, and white smoke puffs out of the dipstick tube. The car doesn't overheat,and the heater works.

Check for any change in coolant level in the overflow reservoir. If no change over, say, 500 miles, you simply have a high level of condensation because there is absolutely no other source of water to the engine. You can...

Car hard to steer after making noise

It sounds like you may have a bad water pump that caused the belt to come off. I would suggest having a technician come out and look at the car and inspect what caused the belt to come off and...

Related articles

How to Check the Voltage of a Car Battery
There are few things more frustrating than discovering that your car won’t start because the battery is dead. A mechanic can measure...
Can a Car Battery Overheat in Hot Weather?
Hot weather can cause battery fluid to evaporate and make it hard to start your car. Battery overcharging decreases the lifespan of your battery.
How to Deal With a Car Battery For Long-Term Storage
If If you store your car for the winter, or for other long periods, it’s important to make sure that your car battery is properly cared for. Long term car storage can wreak havoc on your battery. Isn't it okay...