Ford

Have Ford questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

2013 Ford F-350 6.7 L diesel. Battery light comes on approx…

Hello. 2013 Ford F-350 6.7...
Hello. 2013 Ford F-350 6.7 L diesel. Battery light comes on approx 10 seconds after starting truck and stays lit. New alternator installed, checked 2 of 3 wires to alt plug ok. Looking to check the red wire that runs from the alt to the pcm. Am I on the right track? Or looking in the wrong area?
Show More
Show Less
Ask Your Own Ford Question
Answered in 12 minutes by:
9/21/2017
EricFromCT
EricFromCT, Ford Technician
Category: Ford
Satisfied Customers: 4,645
Experience: 20 years dealership exp., ASE A1-A9 L1 L2, Ford Lincoln Mercury Senior Master, Diesel Certified
Verified

Hi. Welcome to chat! My name is ***** ***** I am currently a factory dealer auto mechanic. I will attempt to assist you with your concern today.

Ask Your Own Ford Question

You are on the right track. I have seen that red wire chaff in the harness that runs down the engine along under the water pump.

Please note that customer satisfaction is my number one goal. Also we can respond in this chat back and forth many times. I may be offline when you respond but I will promptly reply when I return.

Thank you for rating my assistance and for using Just Answer.

Ask Your Own Ford Question
Customer reply replied 9 months ago
Hello. Thank you

You are on the right track. I have seen that red wire chaff in the harness that runs down the engine along under the water pump.

Please note that customer satisfaction is my number one goal. Also we can respond in this chat back and forth many times. I may be offline when you respond but I will promptly reply when I return.

Thank you for rating my assistance and for using Just Answer.

Ask Your Own Ford Question
Customer reply replied 9 months ago
I was having trouble locating the red wire. What is the best way to access it? Is it common to cause this exact issue?

I have seen this on 2 other vehicles with a 6.7 One I found by accident when replacing the water pump and the wire was easy to get to. I think without all the removed your best bet is to go underneath and you will see the harness bolted to the bottom of the engine. A lot of people will just run a test wire from the alternator to the pcm to see if the charging light goes out. To bypass the circuit in question. Then if it works they just overlay their own wire to complete the repair instead of digging around in the harness in a hard to reach location.

Please note that customer satisfaction is my number one goal. Also we can respond in this chat back and forth many times. I may be offline when you respond but I will promptly reply when I return.

Thank you for rating my assistance and for using Just Answer.

Ask Your Own Ford Question
Customer reply replied 9 months ago
I understand. I noticed there is a fusible link on that same red wire, I would definitely like to bypass the wire rather than dig in the harness as you pointed out. Will bypassing the fusible link be ok? Also, which connector does the red alt wire go to? I'm having trouble locating it, I have alldata DIY, but I can't seem to figure out it's actual location under the hood.
Customer reply replied 9 months ago
I was able to locate the other two wires from the 3 wire alt plug to a plug next to the pcm behind the passenger side battery, but cannot locate the red wire.

THe red wire goes from the battery junction box through the fuse link to the generator. That is the generator power. That is not the wire I have seen broken I have seen one of the others that go the pcm broken. EIther the yellow or the violet. Did you ohm out the other 2 that

go from the alternator to the pcm?

Please note that customer satisfaction is my number one goal. Also we can respond in this chat back and forth many times. I may be offline when you respond but I will promptly reply when I return.

Thank you for rating my assistance and for using Just Answer.

Ask Your Own Ford Question
Customer reply replied 9 months ago
I ohmed the yellow and violet wires from the alt to the pcm and they were good. I was next looking to check the small 18 gauge red wire but couldn't find where it went to.

I think the electrical diagram for the charging system may help you.

Please note that customer satisfaction is my number one goal. Also we can respond in this chat back and forth many times. I may be offline when you respond but I will promptly reply when I return.

Thank you for rating my assistance and for using Just Answer.

Ask Your Own Ford Question
Customer reply replied 9 months ago
I checked the yellow and violet wires only from the connector near the pcm to the 3 wire alt plug and they were good.
Customer reply replied 9 months ago
I have the wire diagram from all data. What do you think could be causing the light? Are there any other checks I can do?

Ok. Make sure the red wire has full battery voltage at the plug on the alternator. If that fuse link is weak or high resistance in the circuit the alternator will not be getting battery voltage to run.

Please note that customer satisfaction is my number one goal. Also we can respond in this chat back and forth many times. I may be offline when you respond but I will promptly reply when I return.

Thank you for rating my assistance and for using Just Answer.

Ask Your Own Ford Question
Customer reply replied 9 months ago
Ok I can definitely do that. The alternator is charging at 14.4. Volts as it was prior to replacement. Do you think it's possible that a weak fuse link/higher resistance would still allow the alt to operate normal? Also, where is that fuse link commonly found under the hood? Do you have any guidance on where to look for it without having to take the entire harness apart?

If the alternator is charging at 14.4 I would think that the red wire is good. If one of the monitor circuits going to the pcm was not good then the pcm would put the light because it wouldnt be able to control charging. You could try overlaying the 2 wires, just for testing, from the alternator to the pcm. Also there should be a code stored in the pcm. That may be worth checking. The fuse link is located in the front of the high current battery box which is located on the passenger side front of the engine compartment. Where the 275 amp fuse is.

Please note that customer satisfaction is my number one goal. Also we can respond in this chat back and forth many times. I may be offline when you respond but I will promptly reply when I return.

Thank you for rating my assistance and for using Just Answer.

EricFromCT
EricFromCT, Ford Technician
Category: Ford
Satisfied Customers: 4,645
Experience: 20 years dealership exp., ASE A1-A9 L1 L2, Ford Lincoln Mercury Senior Master, Diesel Certified
Verified
EricFromCT and 87 other Ford Specialists are ready to help you
Ask your own question now
Customer reply replied 9 months ago
Ok sounds good. This one has been a tough diag for me. That's why I enlisted your services. I am going to try checking a few more things. Thank you for your help.

Your welcome. I understand. This stuff can be tough even for a dealer tech like myself. CHeck those things out and feel free to come back to this chat if you have further questions on this. Thanks.

Ask Your Own Ford Question
Customer reply replied 9 months ago
Ok, I'll check those things and write back with further findings and let you know. Thanks again.

Alright. Thanks.

Ask Your Own Ford Question
Customer reply replied 8 months ago
Hello. Eric.
I wanted to get back to you regarding the issue with the Ford F-350 6.7 diesel with a battery light. I found the problem. I unplugged the 3 pin plug at the alternator and checked for battery voltage on the red 18 gauge wire, it measured 9.0 volts with the truck off. I then stripped the wire back behind the plug while the plug was plugged into the alternator and measure voltage with the truck running and it measured 5.0 volts. I then applied battery voltage to the red 18 gauge wire while the truck was running and plugged in and the battery light went out. I now have to find where or why there is some sort of resistance somewhere in the 18 gauge red wire to the alternator. I suspect something with the fusible link or a corroded wire. Just want led to give an update, thanks again for your help.

I would say thats great but you still have to fix it. You are on the right track now for sure. I would also suspect the link or a corroded wire. Good find.

Ask Your Own Ford Question
Was this answer helpful?
Ask EricFromCT Your Own Question
EricFromCT
EricFromCT
EricFromCT, Ford Technician
Category: Ford
Satisfied Customers: 4,645
4,645 Satisfied Customers
Experience: 20 years dealership exp., ASE A1-A9 L1 L2, Ford Lincoln Mercury Senior Master, Diesel Certified

EricFromCT 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
2013 Ford F-350 6.7 L diesel. Battery light comes on approx
Hello. 2013 Ford F-350 6.7 L diesel. Battery light comes on approx 10 seconds after starting truck and stays lit. New alternator installed, checked 2 of 3 wires to alt plug ok. Looking to check the re… read more
EricFromCT
EricFromCT
Ford Technician
4,645 satisfied customers
there is a hose from the water pump connected to a pipe that
there is a hose from the water pump connected to a pipe that goes over the alternator connected to another hose that goes to the heater. the pipe piece is leaking in two places. it's a 1994 ford f150 … read more
Don
Don
Shop Forman, lead tech
Vocational, Technical or Trade Scho
869 satisfied customers
change the belt tensioner on a 1195 Ford Ranger 4 cylinder (no AC)?
How do you change the belt tensioner on a 1195 Ford Ranger 4 cylinder (no AC)?… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
Where is the alternator on a ford v10 engine in a ford
Second opinion] where is the alternator on a ford v10 engine in a ford motorhome chassis … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,610 satisfied customers
Where is the alternator on a ford v10 engine in a ford
where is the alternator on a ford v10 engine in a ford motorhome chassis … read more
EricFromCT
EricFromCT
Ford Technician
4,645 satisfied customers
New alternator light still. Stay on not charging. Alternator
New alternator light still. Stay on not charging JA: Just to clarify, what are the exact lights you're talking about? Customer: alternator light JA: What is the model/year of your Ford? Customer: 2003… read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
What size are the mounting bolts for water pump on 2005 ford
What size are the mounting bolts for water pump on 2005 ford explorer V6 4.0 … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
28,466 satisfied customers
I had a water pump instelled and 4 days later it blue up
I had a water pump instelled and 4 days later it blue up takind the head gasket with it. The mechanic will not stand behind the warranty because he said the head gasket bleu out first. That is not wha… read more
roy
roy
Associate Degree
3 satisfied customers
I have a coolant leak. I have replaced the water pump,
I have a coolant leak. I have replaced the water pump, thermostat and housing, and all hoses. Still have coolant leaking from the front of the engine. Where else could it be coming from? … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
I need a diagram for the water pump bolts on a 91 F350 with
I need a diagram for the water pump bolts on a 91 F350 with 7.5L as well as which ones are water jackets. … read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
694 satisfied customers
Water pump 93 460 ford. I have a question about backing
Water pump 93 460 ford JA: Has the vehicle ever overheated? And when was it last serviced? Customer: Yes I have a question about backing plate JA: Are you fixing your 9-3 yourself? What have you tried… read more
Joecamel90
Joecamel90
Technician
Associate Degree
24 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
I have 2013 f150 with 5.4 engine. replaced water pump and
I have 2013 f150 with 5.4 engine. replaced water pump and thermostat twice and upper radiator hose. Cooling fans are running on high. Used scan tool no codes are shown, temp on gauge shows normal, sca… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Just had water pump, thermostat and thermostat housing
Just had water pump, thermostat and thermostat housing replaced and a system flush. Cooling fan now runs high after a short time driving at city speed. On line forums indicated others with this proble… read more
EricFromCT
EricFromCT
Ford Technician
4,645 satisfied customers
I have a 2013 Escape 1.6L Ecoboost that had a water pump
I have a 2013 Escape 1.6L Ecoboost that had a water pump issue. We replaced the water pump and marked the timing belt before removal. After the water pump was installed we found that the Timing Sprock… read more
APenland
APenland
Ford Senior Master Technician
Associate in Industrial Management
3,186 satisfied customers
I have a coolant leak near the water pump. not sure if it is
i have a coolant leak near the water pump. not sure if it is a bad water pump or if the front cover is junk. Any suggestions on how to determine the cause? … read more
Steve W
Steve W
Line Technician
Vocational, Technical or Trade Scho
1,968 satisfied customers
Trying to replace the water pump on my 2011 F150 with
Trying to replace the water pump on my 2011 F150 with Ecoboost 3.5l engine. Not finding any video or manuals to help. … read more
Mike V.
Mike V.
Auto Service Technician
High School or GED
1,455 satisfied customers
Popped two freeze plugs fixed replaced water pump now water
Popped two freeze plugs fixed replaced water pump now water goes into oil pan … read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 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