Q: Q: Alternator not charging

asked by on

I've replaced the alternator twice and the battery as well as the connector to the alternator but it still won't charge

My car has 171000 miles.
My car has an automatic transmission.

The alternator charging rate is controlled by the engine control module under the air cleaner housing. You should disconnect the battery and check the connections at the engine control module and look at pin 54 on connector one (C1). It is a grey wire that goes to the alternator to control charge rate. Put dielectric lube on connections and reinstall to see if vehicle charges normal at 1200 RPMs. If not, then have vehicle scanned to see if ECM is controlling charge rate. If you are still having trouble, a certified mechanic, such as one from YourMechanic, can come to your car’s location to diagnose your vehicle’s charging issue.

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
  1. Home
  2. Questions
  3. Q: Alternator not charging

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: Grinding..rumbling noise from rear of car when acceleration

Hi there: Assuming you have a front wheel drive LaSabre, this type of noise is typical with worn out wheel bearings on the rear of the vehicle or the emergency brakes are dragging. This issue is common on vehicles more...

Q: How to fix the wiring on my alternator?

Hello. The system is burning the wire connector due to the connection being weak and loose. The wire got hot and melted the first time due to a loose connection causing heat build up. You should also check the battery...

Q: Problem with the taillight fuse blowing out on 1998 Lincoln Mark VIII

Hey there, thanks for writing in about your 1998 Lincoln Mark VIII. I suggest that the wiring circuit of the taillights are inspected by a technician for shorts. There may be a short to power/ground from faulted wiring or incorrect...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...