Ford

Have Ford Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Ford

I have an 2003 Lincoln Navigator and I just bought a new

Customer Question
battery with 600 cranking amps...
I have an 2003 Lincoln Navigator and I just bought a new battery with 600 cranking amps and I had my alternator check and they said everything check out fine but when I turn on my school or my defroster my check charging system light comes on do I need
to get a bigger battery since everything in my car is electrical
Submitted: 2 years ago.Category: Ford
Show More
Show Less
Ask Your Own Ford Question
Answered in 18 minutes by:
7/5/2015
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago
A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 6,667
Experience: ASE Master Certified, ASE Advanced Gasoline Engine Performance
Verified
Who checked the charging system and alternator?
Dealership, auto parts store or aftermarket repair shop?
Ask Your Own Ford Question
Customer reply replied 2 years ago
Auto parts store and I had an after market repair shop take the alternator off and took it to the auto Supply store and to have the alternator check and it checked out fine. But when I turn on my AC or defroster the check charging system light comes on
Ford Mechanic: A. Penland, Ford Senior Master Technician, ASE replied 2 years ago
Your alternator is controlled by the PCM (Engine Computer). The PCM acts like the voltage regulator. The PCM needs to see the alternator output to be 14.3 volts or better when the engine is running. If it drops below 14 volts, the battery light will come on and the AC system is considered a load on the charging system. Your Navigator should have a 750 CCA battery also.
Ask Your Own Ford Question
Ask A. Penland Your Own Question
A. Penland
A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 6,667
6,667 Satisfied Customers
Experience: ASE Master Certified, ASE Advanced Gasoline Engine Performance

A. Penland 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

24,155 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

27,937 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

1,335 satisfied customers

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

< Previous | Next >

Related Ford Questions
Just replaced the alternator and battery in my 1999 Ford
Just replaced the alternator and battery in my 1999 Ford Windstar. The engine turns over, but never ignites. Any ideas? ' … read more
Mechanic01
Mechanic01
1,151 satisfied customers
I have a Motorcraft alternator I bought 18 years ago for
I have a Motorcraft alternator I bought 18 years ago for instillation on a Ford V-6 engine I have installed in an MG. I bought the alternator understanding it had an internal regulator. I had a man te… read more
Matt
Matt
Engineer
Bachelor\u0027s Degree
5 satisfied customers
I had the alternator wire to the battery melt at its
I had the alternator wire to the battery melt at its connection to the alternator I bought a new alternator but want to replace the wire also … read more
Gabriel Grey
Gabriel Grey
Master Service Technician
Associates
181 satisfied customers
Changed out alternator, replaced it with A KNOWN FUNCTIONG
changed out alternator, replaced it with A KNOWN FUNCTIONG alt and it now is only putting out 12.4 volts testing results says bad volt regulator. whats could be taking out volt regulators … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,155 satisfied customers
Alternator died replaced it but still won't start with loud
Alternator died replaced it but still won't start with loud fast clicking when I turn the ignition … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
92 ranger new alternator. Does not charge. fusable link
92 ranger new alternator. Does not charge. fusable link checked. 15a alt fild fuse good. How can I test new alternator to determine it is not defective. Is the field being excited? Can I jumper to exc… read more
Jaybird61
Jaybird61
Master Automotive Mechanic
1,895 satisfied customers
MY 1999 F250 7.3 When cranking engine my alternator charge
MY 1999 F250 7.3 When cranking engine my alternator charge for about 5 min. then stop. Replaced everything Batt, alternator, plug to alternator cant find problem … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,155 satisfied customers
2001ford f150 my battery light came on, the alternator has
2001ford f150 my battery light came on, the alternator has been change, the alternator is not charging the battery, battery 12.4v not running battery 12.1 running and at alternator continuity good fro… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,155 satisfied customers
Not charging. Battery and alternator were both bad according
Not charging. Battery and alternator were both bad according to O'reilly. Before it stopped completely I would be driving down the road and lose power to the radio and instrument cluster for a second … read more
6Bucs
6Bucs
Senior Master Tech
Associate Degree
3 satisfied customers
My battery lite is on and both alternator and battery check
my battery lite is on and both alternator and battery check good is there a relay connected to the circut that's maybe bad? … read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
My alternator and batteries are good. After trial and error
My alternator and batteries are good. After trial and error I figured out there is a disconnect between the positive cable between the battery and alternator. I notice that wire has multiple connectio… read more
6Bucs
6Bucs
Senior Master Tech
Associate Degree
3 satisfied customers
2004 focus zx3 not charging. Replaced alternator, bur
2004 focus zx3 not charging. Replaced alternator, bur voltage shows flat. diagnostic says alternator providing charge … read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
290 satisfied customers
Have an 88 f150 that has a good battery and alternator,
have an 88 f150 that has a good battery and alternator, tested today at N … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,155 satisfied customers
Alternator not charging battery indicator light on an
Alternator not charging battery indicator light on an instrument cluster. I only have two wires coming out of the pigtail on the alternator … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,931 satisfied customers
The battery light is on. Is there a fuse for the alternator
The battery light is on. Is there a fuse for the alternator on a 2004 Ford Explorer V8 4.1 … read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
Just replace battery and alternator now engine idle low and
just replace battery and alternator now engine idle low and dying. … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
The battery light is on and the alternator is not charging
The battery light is on and the alternator is not charging enough … read more
A. Penland
A. Penland
Ford Senior Master Technician, ASE
6,667 satisfied customers
Battery not charging have replaced the alternator and it
battery not charging have replaced the alternator and it st5ill wont work … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
27,937 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