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Battery light is on 04 Ford Freestar. Tried several

Customer Question
alternators with no result, got...
Battery light is on 04 Ford Freestar. Tried several alternators with no result, got the last alternator prior to installation. Drove the van for over a week, alternator seems to be charging fine but the light is still on
Submitted: 10 months ago.Category: Ford
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Answered in 1 minute by:
9/29/2017
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 10 months ago
AMEDEE
AMEDEE, FORD TECHNICIAN
Category: Ford
Satisfied Customers: 28,310
Experience: ASE CERTIFIED TECHNICIAN ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

My name isCustomerand I can assist you with your question.

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Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 10 months ago

Where did you get the alternator from?

What is the battery voltage at with the engine at idle?

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Customer reply replied 10 months ago
I tried 2 remanufactured ones from Autozone, then a remanufactured Bosch, now I put a used original Motorcraft but I got it tested prior to installing. Voltage immediately after installation was about 13.6 but I haven't measured it after
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 10 months ago

Would you be willing to speak on the phone?

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Customer reply replied 10 months ago
Texting is fine, I think it works for me this way
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 10 months ago

Ok, no problem.

Does the battery light turn off if you disconnect the plug going into the back of the alternator and run the engine?

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Customer reply replied 10 months ago
No, it stays on
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 10 months ago

Can you post your VIN?

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Customer reply replied 10 months ago
2FTZA54684BB24683
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 10 months ago

Are there any codes stored in the computer?

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Customer reply replied 10 months ago
P1633 PCM Keep Alive Memory Voltage Too Low
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 10 months ago

Thank you for that information.

As long as the power supply is good going into the PCM (including the fuse), this condition is caused by a faulty PCM.

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Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 10 months ago

I am glad I can help!

Please don't forget to honor your good faith deposit by rating my answer as "5 STARS or SMILEY FACES" for assisting you today.

Keep in mind, we can still continue this conversation at no further cost to you even after you rate my answer. Just reply back to me using this page and I will get it and get back to you ASAP!

I just ask that you allow time in between replies as I may be helping other customers or off line spending time with the family.

Also, if you are a member or if you have a subscription to the site, you still need to rate my answer in order for me to get credit for assisting you with your question.

You should see the rating system towards the top of the page.

Please let me know if you have any further questions.

Thanks and have a great day!!

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Customer reply replied 10 months ago
Is there a way to check the PCM?
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 10 months ago

YES using a scanner.

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