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04 f-150 check charging system came on. replaced altenator…

Customer Question
04 f-150 check...

04 f-150 check charging system came on. replaced altenator checked battery and cleaned terminals and check charging system still comes on. can start truck everything is fine then the check charging comes on. turn off truck and restart and everything is fine for a few minutes then does it again

Mechanic's Assistant: Does the battery look like it's leaking? And does it have a strong smell -- like sulfur?

No, new battery and i had it checked

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

Replaced the altenator, cleaned the terminals

Submitted: 7 months ago.Category: Ford
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Answered in 5 minutes by:
9/30/2017
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 7 months ago
A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 6,890
Experience: ASE Master Certified, ASE Advanced Gasoline Engine Performance
Verified

Do you have a digital multi meter to do a few electrical tests for me?

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Customer reply replied 7 months ago
No
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 7 months ago

The charging system in your 2004 F150 is controlled by the PCM (Engine Computer) and the PCM needs to see 14.2 volts from the alternator within 3 seconds of the engine starting. If not, the light will come on. Plus, if the PCM sees a problem with the charging system, it will turn the light on.

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Customer reply replied 7 months ago
I'll have to get a multimeter and test it. I did replace the alternator but I noticed when I started this I had a lot of corrosion on my negative battery post. I did test the battery and they said it was fine I just wonder if maybe it's coming from my terminal connection somehow. My gauge seems to be in a normal position it's just at the light comes on after a few minutes after I start the truck
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 7 months ago

Check the positive and the negative cables at the battery. Corrosion will cause numerous issues.

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Customer reply replied 7 months ago
Have cleaned them with a wire brush.
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 7 months ago

You will need to properly test the system to make sure.

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Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 7 months ago

Ok.

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Customer reply replied 7 months ago
Multimeter shows 14.27 at idle at the terminal
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 7 months ago

What is the voltage at the alternator and then at the battery?

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Customer reply replied 7 months ago
1235. 1228
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 7 months ago

With the engine running?

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Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 7 months ago

That alternator is not charging. It should read 14 volts or more at the battery and the alternator with the engine running.

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