Ford

Have Ford Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Ford

F250: I have a 2002 f 250 7. 3 diesel the alternator is not

Customer Question
I have a 2002 f...
I have a 2002 f 250 7. 3 diesel the alternator is not charging the battery I have a orange and a green wire in the back of the alternator showing voltage even when the key is in the off position
Submitted: 2 years ago.Category: Ford
Show More
Show Less
Ask Your Own Ford Question
Answered in 33 minutes by:
6/17/2015
Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 2 years ago
HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
Satisfied Customers: 6,000
Experience: 28 years Auto experience, Ford ,GM, Chrysler, Asian & European
Verified
Hello, the orange/light blue wire should be hot all the time, the green/red should only be hot with the key on or in run, that wire is the power supply from the instrument cluster battery indicator. The large battery cable should be hot all the time. Long as they are hot when running it should be charging so it sounds like you have a defective altenator
Ask Your Own Ford Question
Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 2 years ago
Yes both those wires to the regulator should be hot when running
Ask Your Own Ford Question
Customer reply replied 2 years ago
They're hot all the time
Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 2 years ago
even with it unplugged from the altenator?
Ask Your Own Ford Question
Customer reply replied 2 years ago
Yes
Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 2 years ago
Ok strip the harness back a bit only the orange wire is hot all the time or you can pull the F2. 45 fuse in the central junction box. that should kill power on the green wire unles it is melted together in the harness loom
Ask Your Own Ford Question
Customer reply replied 2 years ago
Do you by chance have a fuse schematic?
Customer reply replied 2 years ago
Are you saying with them both hot it's preventing the alternator from charging
Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 2 years ago
here is the altenator circuitIt shouldnt both be hot with the key off just the one, the fused one is hot with key on or running. if the two wires are melted together in the loom it can cause a voltage drop and lack of charging
Ask Your Own Ford Question
Ask HDGENE Your Own Question
HDGENE
HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
Satisfied Customers: 6,000
6,000 Satisfied Customers
Experience: 28 years Auto experience, Ford ,GM, Chrysler, Asian & European

HDGENE 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

24,320 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

28,139 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

1,380 satisfied customers

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

< Previous | Next >

Related Ford Questions
Good battery new alternator but not charging 2003 ford f150.
Good battery new alternator but not charging 2003 ford f150 … read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
01 Ford escort 2.0 Installed reman Alternator,new battery.
01 Ford escort 2.0 Installed reman Alternator,new battery. Still not charging. Battery light stays on. @ idle 12.4 volts. What did I miss?… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
28,139 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
I related the solenoid, the alternator, and the battery.
I related the solenoid, the alternator, and the battery. Interior light comes on. Nothing else. Will not start. … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,320 satisfied customers
2002 f150 4.6. Replaced battery, alternator and solenoid on
2002 f150 4.6. Replaced battery, alternator and solenoid on fire wall. Something is draining the battery bad. … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,320 satisfied customers
I have replaced the alternator and battery, now it will
I have replaced the alternator and battery, now it will start but shortly after the display in instrument cluster quits displaying the milage and then it stalls and wll not restart. I recharge battery… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
28,139 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
I have removed plug from alternator and it looks ok. the
i have removed plug from alternator and it looks ok. the connectors look fine but have not remove wires from harness. is this possible or will i damage plug?… read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
My 1999 f350 ford pickup has burned up the alternator after
my 1999 f350 ford pickup has burned up the alternator after 2 years,should i look furter … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,320 satisfied customers
2005 Ford Escape 3.0 alternator charging 19.7 on vehicle but
2005 Ford Escape 3.0 alternator charging 19.7 on vehicle but test good at 14.3 on tester … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
2,232 satisfied customers
The alternator was just replaced and now about 150 miles
The alternator was just replaced and now about 150 miles later while going down the interstate the rpms started climbing and now the transmission will not go into gear … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
I got powered to the alternator in big wire aND the yellow
I got powered to the alternator in big wire aND the yellow wire but she tg car is running nou power coming out of the gray wire… read more
Steve W
Steve W
Line Technician
Vocational, Technical or Trade Scho
1,968 satisfied customers
Battery drain! New Alternator, and battery... Car dies
Battery drain! New Alternator, and battery... Car dies randomly, or gages go crazy wanting to shut off but don't. Battery has drained a few times now but I have wires all over the place .attached to a… read more
Gabriel Grey
Gabriel Grey
Master Service Technician
Associates
373 satisfied customers
Put a new alternator on and it won't charge still. 95
Put a new alternator on and it won't charge still JA: What is the model/year of your Ford? Customer: 95 Mustang GT 5.0 JA: Are you fixing your Mustang GT yourself? What have you tried so far? Customer… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,410 satisfied customers
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
1,716 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
373 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
24,320 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
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