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Battery light is on. The garage just change battery and

Customer Question
Battery light is on ...

Battery light is on

Mechanic's Assistant: Have you tested the battery? Have you tried testing the alternator?

The garage just change battery and alternator.. it still on i went back and they test the new alternator and fully change the battery ... and still the light stay on

Mechanic's Assistant: What is the model/year of your Ford?

2010 f-150 5.4l

Mechanic's Assistant: Are you fixing your F150 yourself? What have you tried so far?

Im gonna try it myself

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

All there

Submitted: 5 months ago.Category: Ford
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Answered in 2 minutes by:
3/16/2018
Ford Mechanic: Ron, ASE Certified Technician replied 5 months ago
Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 25,022
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Hello. My name is ***** ***** I am happy to assist you today. Give me just a moment to review your post, and I'll be right back with the help you need.

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Ford Mechanic: Ron, ASE Certified Technician replied 5 months ago

Is the alternator charging at 14 volt at the battery with the engine running?

What brand of alternator did they install?

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Customer reply replied 5 months ago
a brand new Denso and yes its charging 14 volt
Ford Mechanic: Ron, ASE Certified Technician replied 5 months ago

What usually happens with installing the aftermarket alternator is its not designed for the computer controlled charging system that your 2010 F 150 has, and they will usually charge correctly but will not turn off the battery light. You can likely resolve this issue by installing an OEM Ford alternator.

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Customer reply replied 5 months ago
it a OEM ford DENSO 150 amp .I still have the old Alt which i got it tester and the guy just call me telling me that nothing is wrong with i also compare and they are both the exact same Alt parts number and all.. i also start cleaning all the connection starting by battery. all the ground behind engine in fire wall, the ground next to the battery in the fender.
Customer reply replied 5 months ago
Part #: GL987 (10346)
Ford Mechanic: Ron, ASE Certified Technician replied 5 months ago

Have you scanned the system to see if the PCM is detecting any fault codes?

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Customer reply replied 5 months ago
i have scan no code.
Ford Mechanic: Ron, ASE Certified Technician replied 5 months ago

l I am not aware of any other issue on a properly charging alternator besides it being the wrong alternator which in your cases you say is not the problem so I will open this post back up for you and perhaps someone else may have something new to add.

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Customer reply replied 5 months ago
no it all good i wanted to make sure with an expert before sending it directly to Ford dealership. Im gonna let someone more qualified then me to deal with this. Thanks for your help i appreciate it.
Ford Mechanic: Ron, ASE Certified Technician replied 5 months ago

Okay, thank you as well. If you do not mind, can you let me know what the end results turn out to be?

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