Alternator replacement instructions?

NOTARY

MEMBER
2000 DODGE INTREPID

I was driving and my battery light came on. I parked to check the wires and then the car wouldn't start. After a while it started again as I was driving I noticed I could not put the power windows down and the car seemed to be trying to accelerate by itself so I got scared and pulled over the car went off and would not start. I got a jump then finally had the car towed home. The car has electrical problems as well since the radio only works depending on the driver window settings. I know it's weird but true. I have to have the window a certain level for the radio to work. I am going to take the car to my mechanic but do not want to get ripped off. The car was struggling to start a few days ago. I would appreciate your thoughts.

Thursday, March 12th, 2009 AT 8:12 PM

1 Reply

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

It sounds like you have a faulty alternator. The alternator is designed to keep the battery charged. If it isn't doing its job, the battery will get weak and the result could be what you described.

Before you replace it, here is a link that explains how to test one. Follow the directions in the link. All you will need is a voltmeter or multimeter.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Now, on this vehicle, the alternator may be good but not charge the battery. The alternator is regulated via the powertrain control module (PCM). The circuit in the PCM can fail and prevent charging.

So, if you find the battery isn't charging, next, remove the alternator and have it bench tested at a parts store. Most will do this free of charge.

Here is a link that explains in general how to install an alternator. Use this as a guide.

https://www.2carpros.com/articles/how-to-replace-an-alternator

If the alternator checks good, at that point I would recommend having the PCM tested to confirm it is the problem.

I attached the directions below specific to your vehicle for alternator removal and replacement.

I hope this helps. Let me know if you have other questions.

Take care,

Joe

See pics below.

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