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danny, Mechanic
Category: Car
Satisfied Customers: 5064
Experience:  Mechanic at school corp bus garage! Experience in fleet diesel and regular automotive.
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2003 Lincoln Aviator: The alternator went bad and I had it..reman

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I have a 2003 Lincoln Aviator. The alternator went bad and I had it replaced with a new not a reman alternator. I also went ahead and replaced the battery as well. Now the check charging system light stays illuminated all the time. I have had the alternator tested and it is putting out the correct voltage. The battery also cell checks and load checks perfect. All connections are secure. Vehicle runs and starts perfectly. My mechanic attempted to reset the light using a snap-on scan tool with no success. What must be done to reset this light ?

Check your fuses and make sure your inline fusable link is not blown.graphic





This is a pdf of testing for your issue.

Customer: replied 7 years ago.
<p>I have performed all of the test up to test B4. Could you please tell me where the PCM is located on this vehicle so that I can perform these final two tests, then I will accept the answer so you can receive your funds. I greatly appreciate the help thus far unfortunately for me it is looking like it is going to be a PCM problem. Hopefully these final two test will tell me for sure, I just need to know the location of the PCM. </p><p> </p><p>thanks,</p><p> </p><p>cm</p> Just make sure its not a fusable link.
Customer: replied 7 years ago.
checked all of the fusible links in the wires coming from the alternator over to the harness and everything looked good. there is a green and black wire i believe it is coming from the voltage regualtor plug in the top of the alternator. the wire goes down and around and plugs into another plug near the radiator support. i think that plug goes to the pcm and i believe this is the wire the pcm uses to turn the light out. it seems there is no power going through this wire. we used a circuit tester at multiple points along the wire i can't get any juice from it. that is why i think it is not getting a signal from the pcm. i will perform the other test over the weekend and get back to you. thanks again.

your very welcome good luck.
danny and 3 other Car Specialists are ready to help you
Customer: replied 7 years ago.

after extensive testing we determined that it is the PCM that is causing the problem. it is going to be an expensive fix, but thanks for the help and info. so we were able to accurately diagnose the problem.





your very welcome make sure you check with module they have rebuilds and the salvage yard may have a good one.
Customer: replied 7 years ago.
ok thanks i will do that.
K good luck