Skip the auto shop - Our mechanics make house calls

Q: Alternator reading low on voltage meter

asked by on

The alternator reads 0 on a voltage meter. The car is still running with a three year old battery.

A: I need to know where you’re testing the vol...

I need to know where you’re testing the voltage and what problem you are having. A proper way to test the for voltage is at the battery terminals with the car running. When the car is running you should read 13.5 to 14.5 volts. If it is below that then you have a bad alternator if it above that or fluctuates then you have a bad alternator. A certified mechanic would be able to test if your alternator needs replacing.

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: my 300 fan

Hi there. It is possible that you may have an obstruction or blockage inside the vents of your AC and heating system. It is also possible that the blower motor or control vents are damaged or wearing out. It's probably...

Q: Wheel play

Hopefully, the axle nut was properly torqued, using a torque wrench set to Factory Service Manual specifications. That step is very critical to ensuring maximum service life on replacement wheel bearings once installed. If the axle nut was properly installed...

Q: Car misses

If you have went as far to do compression and leak down, I’ll assume the problem is not obvious. After those tests, you can be almost sure the mechanical components of the engine are good. Is it a random misfire...

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...
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...
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.