Charging system dash light

Tiny
CHUCK L.
  • MEMBER
  • 2004 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
My dash light showing a charging problem, and the computer display continuously display a problem. The charging gauge shows no problem. The auto electrical shop says everything is working fine, battery, alternator, etc. What do I have to do to fix this?
Wednesday, October 2nd, 2019 AT 4:59 PM

3 Replies

Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
The charging system can pass all tests and still have a bad voltage regulator (integral to the alternator). Especially with aftermarket alternators! They just don't work very well! Has the alternator been replaced? I'd like to know before I get more in depth with diagnosis.
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Wednesday, October 2nd, 2019 AT 5:45 PM
Tiny
CHUCK L.
  • MEMBER
  • 4 POSTS
Yes, according to the previous owner, the battery and the alternator were replaced. When I bought the vehicle and saw the charging light was lit, I asked, then took the vehicle to a shop and had the system checked. In the ten months I've owned the truck, I have never had an issue with a low battery or trouble starting, and the voltage gauge shows proper output of 13.5 volts, but the light stays on and the computer will give the check charging system warning every 15 or 20 minutes.
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Wednesday, October 2nd, 2019 AT 11:21 PM
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
It could have an aftermarket alternator. I would either have this alternator warranty replaced or get a Motorcraft re-manufactured unit. This is where I would start before chasing down circuits that could take hours on end.
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Thursday, October 3rd, 2019 AT 1:39 PM

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