Ford

Have Ford questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

Name is ***** *****, My issue is with my 2004, F-150 Lariat,

Customer Question
Name is ***** *****...

Name is ***** *****, My issue is with my 2004, F-150 Lariat, 5.4L V8. I have a check charging system light, I have installed a new battery and alternator, had both check and they are good and putting out the correct voltage. However; I am still getting the check charging system indicator.

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

The check charging system indicator came on and my truck components went out. No lights, radio, gauges so I made it home and the truck would not crank. I bought a new battery, the truck started and after about 20 minutes the check charging system light came on again. I replaced the alternator with a new one, still same problem. Took the truck to a shop they tested the battery and alternator both were good. They did a load bearing test. Battery and alternator passed. however I still have the check charging system indicator.

Submitted: 2 years ago.Category: Ford
Show More
Show Less
Ask Your Own Ford Question
Answered in 22 minutes by:
3/5/2016
Ford Mechanic: Adam Legler,
 replied 2 years ago
Adam Legler
Category: Ford
Satisfied Customers: 31
Experience: Service Advisor at Antero Automotive
Verified

Hello, my name is ***** ***** I'm here to help. I have 13 years experience as a master and advanced level technician. I saw you have a concern with your ford and it sounded very familiar to me so I'd like to offer my assistance.

First off, I'd like to ask you a couple additional questions so we can narrow down what we're fighting here. If at anytime you're not comfortable with what I'm asking please let me know and we can find a way around it.

Ask Your Own Ford Question
Customer reply replied 2 years ago
Ok
Ford Mechanic: Adam Legler,
 replied 2 years ago

First off, does your alternator lamp flicker, or change illumination if you rev the motor up?

Next, have you had any shop/parts store check the PCM for codes? Sometime they will throw a p1246

After these questions, I may ask you to do some pinpoint testing, do you have a multimeter and how comfortable are you using it?

Thank you, I'm looking forward to helping you resolve your concern.

Ask Your Own Ford Question
Customer reply replied 2 years ago
does your alternator lamp flicker, or change illumination if you rev the motor up? No, it does not, the battery light comes on and a message "Check Charging System" they do not flicker or change illumination, it is consistantNext, have you had any shop/parts store check the PCM for codes? Sometime they will throw a p1246 : No I had a shop check the battery and alternator to see if they were good and putting out the correct amps/voltage.After these questions, I may ask you to do some pinpoint testing, do you have a multimeter and how comfortable are you using it? No I do not have a multimeter, however; I do know how to use it.Thank you, ***** ***** forward to helping you resolve your concern.
Ford Mechanic: Adam Legler,
 replied 2 years ago

Thanks for the reply.

IF a multimeter were available, the next test would be to unplug the regulator harness from the alternator. Measure the resistance from the Battery Sense terminal to the GENCOM terminal, (on the alternator, Not the harness). Must read 950 to 1050 ohms.

If it were even borderline close to being out of range I'd suggest another alternator.

The other possibilities would be that small 2 pin connector that clips into the alternator may have a bad connection or broken wire. Again, if a multimeter was available we could test those 2 wires back to the PCM and confirm they are ok.

Just a quick edit: even though your alternator IS charging it may be possible that this connector may be damaged still, it was common in the earlier 5.4 and 4.6 motors

Your question caught my eye because I've had an experience just like yours with a bad aftermarket alternator. Even if you believe the brand is reputable, my suggestion would be to exchange it for another brand. It would be a quick rule out of one possibility.

Let me know which direction you choose to go and please feel free to ask any questions you may have. Also don't hesitate to ask for any clarification if needed. Again, I look forward to helping resolve your concern and thanks for you question

Ask Your Own Ford Question
Customer reply replied 2 years ago
will I be able to reach you, anytime once I have checked the alternator with you suggested method.And if that is not the case is there another possible solution that I can check as well?
Ford Mechanic: Adam Legler,
 replied 2 years ago

I think that between the harness or the alternator itself that will be about as much as we can narrow the field down without some more testing equipment.

If you're thinking about making it happen this weekend I'll be more than happy to leave our chat open. I'd like to do that until I know your concern is fixed. I try to check in about every hour, so if you find anything or think of any additional questions let me know. Thanks again!

Ask Your Own Ford Question
Customer reply replied 2 years ago
ok
Ford Mechanic: Adam Legler,
 replied 2 years ago

Hello again, hope you had a great weekend. Were you able to find anything on your truck this weekend? Again, please feel free to ask any questions you may have. I look forward to helping you resolve your issue ASAP. Thanks again!

Ask Your Own Ford Question
Ford Mechanic: Adam Legler,
 replied 2 years ago

Sincerely ***** ***** concern has been corrected. If so, please feel free to rate me with outstanding service! If not please let me know so I can help for a speedy resolution. Thanks again

Ask Your Own Ford Question
Customer reply replied 2 years ago
Adam, everything I tried has not worked. I got a multimeter and tested the battery and alternator, everything checked out for the battery. I took the alternator to a shop and they checked it and it was fine. However; it is still not charging the battery.
I believe it maybe the wiring harness but it is very difficult to fined the part. Is there anything else I can check regarding this problem?
Ford Mechanic: Adam Legler,
 replied 2 years ago

Defiantly an odd issue you have going on. We can actually test the harness, that will help rule out the possibility of it begins good or bad. Give me a moment to pull a wiring diagram.

Thanks again for the reply, again I look forward to helping you resolve your concern

Ask Your Own Ford Question
Ford Mechanic: Adam Legler,
 replied 2 years ago

Attached is a wiring diagram for your pickup. Before we use it though, I'd like you to perform a couple tests with me. Again, if at anytime something is unclear or your not comfortable let me know.

Disconnect the voltage regulator (the plug, not the large cable) on the alternator. Start the engine and briefly snap the throttle to raise the RPM over 2500. The alternator should self excite and charge at a consistent roughly 13.5 V.
If that test comes back negative, the next thing I'd like you to try is to ground the body of the alternator over to the negative side of the battery. This can be done with the clamps on one circuit of a jumper cable. CAUTION: make sure everything is out of the way of the fan and belt. Also make sure you're going from the BODY or the alternator (the aluminum casing) to the negative terminal on the battery.

Finally, the last thing I would suggest is if the large battery cable that leads out from the alternator, with everything plugged in test voltage right there and see if it differs from what your reading at the battery. Also if your multimeter has sharp probes try poking at different spots along the harness, same wire of course, seeing if the voltage differs.

In addition. Check that wire diagram attached, there are disable links in that charging circuit. They act like inline fuses that are pieces of wire. Checking them is a matter of confirming continuity in front and behind them. Let me know your results of the above tests. I look forward to helping!

Ask Your Own Ford Question
Was this answer helpful?
Ask Adam Legler Your Own Question
Adam Legler
Adam Legler
Adam Legler
Category: Ford
Satisfied Customers: 31
31 Satisfied Customers
Experience: Service Advisor at Antero Automotive

Adam Legler is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on.

Rich DUSA

Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me.

MollyUSA

I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service.

Jason V.Kirkland, WA

I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there.

BRNew Jersey

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

< Previous | Next >

Meet the Experts:

Ron

Ron

ASE Certified Technician

24,610 satisfied customers

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Chris (aka- Moose)

Chris (aka- Moose)

Technician

28,466 satisfied customers

16 years experience

John Mc

John Mc

Ford Technician

5,495 satisfied customers

19 years Ford Lincoln Mercury experience

Chuck

Chuck

ASE Certified Technician

1,685 satisfied customers

33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

Cam

Cam

Journeyman Automotive Technician

10 satisfied customers

GM Grand Master Technician 2007. 14 years Automotive experience.

Richard

Richard

ASE Certified Technician

1,524 satisfied customers

12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.

Mike V.

Mike V.

Auto Service Technician

1,455 satisfied customers

25 years experience on all makes and models, Licensed NYS Inspector.

< Previous | Next >

Related Ford Questions
Why does my car keep dying even with a new battery and alternator?
Why does my car keep dying even with a new battery and alternator? The battery light stays on but sometimes will go off for a few seconds. I guess that is when the alternator will charge the battery a… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,610 satisfied customers
2006 ford escape: light came back..new battery..ground..about 20 min
2006 ford escape changed alt was not charging. new alt went in no problems other then where it is but no the light came back on alt is only putting out 11V and 6 A ? new battery was installed 4 months… read more
Alex M
Alex M
Automotive Technician
Diplom
858 satisfied customers
2003 ford expedition: My battery..alternator..fusible link..relay
My battery charge light lit up on my 2003 frod expedition 4.6L. I changed the battery and the alternator and the light is still on. I checked the fusible link to see if it in tact and also checked the… read more
mustangmike
mustangmike
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
492 satisfied customers
I installed a new alternator in my 2005 2.3l ford escape and
I installed a new alternator in my 2005 2.3l ford escape and it is not charging the battery. I checked the fuse and it is good, the battery was tested and it is good, the 3 wire plug is good, and the … read more
APenland
APenland
Ford Senior Master Technician
Associate in Industrial Management
3,186 satisfied customers
I've changed the alternator and battery and the battery
I've changed the alternator and battery and the battery light comes on until I hit 2800 rpm. But tonight, with no auxiliary accessories but head lights and dash running the battery went to no power an… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
28,466 satisfied customers
The alternator is not charging the battery. We have tested
yes we have tested the battery and no it is not leaking … read more
roy
roy
Associate Degree
3 satisfied customers
The alternator just stop supplying voltage and its not
the alternator just stop supplying voltage and its not charging the battery … read more
Michael
Michael
Automotive Technician
High School or GED
257 satisfied customers
Where is the fuse for the alternator? Had alternator
had alternator rebuilt, but still not charging battery, so we figure its a fuse?… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
No power to alternator at and red wire, 2003 f250 7.3. let
2003 f250 7.3. let truck run for about 10 min and rechecked and it has no volts … read more
Steve W
Steve W
Line Technician
Vocational, Technical or Trade Scho
1,968 satisfied customers
Alternator doesn't start charging until battery is
alternator doesn't start charging until battery is completely dead … read more
Michael
Michael
Automotive Technician
High School or GED
257 satisfied customers
Replaced batteries, alternator and voltage regulator plug,
replaced batteries, alternator and voltage regulator plug, but I still have a battery light on … read more
Jagmaster
Jagmaster
Bachelor's Degree
346 satisfied customers
2001 f350 7.3, alternator quit charging, changed alternator
2001 f350 7.3, alternator quit charging, changed alternator and now charges for short time and voltage gradually drops, I've been a semi mechanic for 12 years and own my own shop, saying that.... I do… read more
APenland
APenland
Ford Senior Master Technician
Associate in Industrial Management
3,186 satisfied customers
Once pulling tensioner and alternator bolts out alternator
once pulling tensioner and alternator bolts out alternator still wont come dont want to pry onit and crack housingwhats the best way to get it out 2013 ford f150 5.0 engine … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
2004 expedition charging system problems. Replace alternator
2004 expedition charging system problems. Replace alternator & battery. Battery light says on and info center says check charging system. No odbII codes come up. What might it be? Have 14 volts at bat… read more
Drew(supermazdatech)
Drew(supermazdatech)
Senior Mazda Tech.
Vocational, Technical or Trade Scho
2,215 satisfied customers
2006 ford: check charging system light keeps coming on...ve checked
I have a 2006 ford 500. The check charging system light keeps coming on. I've checked the battery and it's ok. I've checked the alternator and it check ok. What is causing this?… read more
molurch
molurch
Owner
Vocational, Technical or Trade Scho
941 satisfied customers
Ford Explorer Making Noise When Stepping On Gas Pedal.
2002 Ford Explorer is making a ticking sound when I step on the gas pedal. I went to get an oil change and thought that might be the problem but the ticking sound continues when I accelerate on the ga… read more
Dr.Automotive
Dr.Automotive
Associate Degree
62 satisfied customers
2005 FORD MUSTANG: DASH BOARD..chec..BATTERY LIGHT CAME..LOOKS FINE
HELLO, I HAVE A 2005 FORD MUSTANG 1ZVFT80N955147744. THE CAR SHOWING A MSG AT DASH BOARD "CHECK CHARGING SYSTEM" AND THE BATTERY LIGHT CAME ON BUT THE CAR LOOKS FINE CHARGING AROUND 14 V. WHAT COULD B… read more
Shawn
Shawn
Self Employed
Vocational, Technical or Trade Scho
3,663 satisfied customers
ford escape: battery light
I have a2005 ford escape, battery light is on and it's not charging, I know the computor helps the alt to work, Can i fix this my self ?… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x