Q: changed altenator, still no power going to battery

asked by on January 09, 2017

installed new altentaor but still have no power going to battery

Battery will not hold a charge Inspection $79.99 - $89.99 Get a Quote

If the alternator is "new", and thus presumably good, the vehicle engine is running, the alternator drive belt is appropriately tightened, and yet you are not getting around 14.5 volts of charging current at the battery posts, that means there is an open in the charging circuit between the alternator and the battery. That open could be due to a bad fuse, corroded terminals or wiring, a wire break, or other circuit fault. To resolve this, the recommended service is a battery is not charging diagnostic. If you request that diagnostic, a certified mechanic will come to your location, identify the fault and estimate the repair. Please let us know if you have additional concerns or follow up questions.

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

What others are asking

Car didn't start so I got a jump. When it started hearing squealing sound. 2007 Honda Accord

Hello - your symptoms suggest that the alternator is not functioning properly due to a worn or stretched serpentine (aka accessory) belt. This problem could also be caused by a failed serpentine belt tensioner, or failed bearings in the alternator...

Brake Lights don't work

If both of these features quit working at the same time, you may just have blown a fuse. If neither one of these are related, the problem may be two separate ones. The power locks are controlled by a...

Car won't start even after replacing the battery

It depends on the nature of the no start. If the vehicle is not cranking, then the battery charge level needs to be checked. If the battery is dead then you likely have a parasitic draw taking the battery charge...

Engine turns over, doesn't start

Since this is a 1970 model, then you may have a problem with the ignition system or the carburetor not getting or giving fuel. The points in the distributor or the carburetor may be plugged. I recommend having a mechanic,...

My console is not working can't turn on my air or radio.. Can't defrost

Hello. I would start by load testing the battery and the alternator. Most of the time when this happens all of a sudden it is because there is a loss of voltage in the electrical system. If that is fine...

Car shakes and starts to die while idling

The battery dying is it’s own issue. It could be the battery itself, the charging system, or an electrical drain when the key is off. All of these will need tested to find the culprit. The engine running poorly and...

Bad alternator? 1996 Chevy Blazer

Hi there - the fact that the engine won't stay running when jumper cables are removed suggests that either the alternator has failed, or the battery has a dead cell, preventing it from conducting current. Both components can be checked...

Screen on the dash goes black randomly

I hate to be the stereotypical dealer mechanic, but the issue may be “normal.” According to the GMC bulletin PIC6106, the display screen may reset during high load situations. This is considered normal and will most commonly happen during a...

Had oil and battery changed, and now the car will not start.

It is possible that during the battery replacement and oil change that something was unplugged accidentally. It is also possible that the battery could have been installed incorrectly. If the engine is cranking it is turning over. If everything was...

Related articles

How to Fix a Car That Won’t Start
Having a car that doesn't start is frustrating. Try a battery test, fuel pump test, and check the spark plugs to help get your car started again.
Symptoms of a Bad or Failing Tailgate Lock Solenoid
Common signs include the tailgate not unlocking and the tailgate opening on its own without any buttons being pressed.
How Long Does an Auxiliary Battery Last?
When When a dual battery system is added to a vehicle, it is usually because accessories have been added to the vehicle that are not factory-standard, and the primary battery in the vehicle does not deliver sufficient power to drive...