Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Connect one-on-one with {0} who will answer your question

This answer was rated:

I have a 2003 Peterbilt 379 cab and it keeps burning out the…

I have a 2003...

I have a 2003 Peterbilt 379 cab and it keeps burning out the brake light switch

Mechanic's Assistant: What is the complete model and serial number of your machine?

2003 Peterbilt 379, the last 6 numbers of the vin is 589918

Mechanic's Assistant: Are you fixing this yourself? What have you tried so far?

Not yet, the mechanic at work is gonna take a look at it

Mechanic's Assistant: Anything else you want the equipment mechanic to know before I connect you?

This month I have replaced the brake light switch two times and now 3 times with this one this time this month

Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 3 hours by:
10/19/2018
Technician: Kent Van Wagner,
 replied 3 years ago
Kent Van Wagner
Category: Medium and Heavy Trucks
Satisfied Customers: 20
Experience: Shop Supervisor/Service Manager at Edstrom Construction
Verified
Hey bud my name is***** me see if we can get this figured out for you today. We actually have a couple 379s in our fleet and they're my favorite to work on.
Ask Your Own Medium and Heavy Trucks Question
Technician: Kent Van Wagner,
 replied 3 years ago
Now, with what you have stated I believe your truck or trailer has a possible short to ground. Does the problem still seem to occur with or without the trailer attached? Also do any of the light seem dimmer than the others with the brakes held?
Kent Van Wagner
Category: Medium and Heavy Trucks
Satisfied Customers: 20
Experience: Shop Supervisor/Service Manager at Edstrom Construction
Verified
Kent Van Wagner and 87 other Medium and Heavy Trucks Specialists are ready to help you
Ask your own question now
Customer reply replied 3 years ago
I haul Sand and Gravel and it is a truck and transfer trailer. Come to think of it it has always happened when I have my trailer with me never as a 10-wheeler
Technician: Kent Van Wagner,
 replied 3 years ago
Phone call session started
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Kent Van Wagner Your Own Question
Kent Van Wagner
Kent Van Wagner
Kent Van Wagner
Category: Medium and Heavy Trucks
Satisfied Customers: 20
20 Satisfied Customers
Experience: Shop Supervisor/Service Manager at Edstrom Construction

Kent Van Wagner is online now

Related Medium and Heavy Trucks Questions
I need help im half way on a 07 pete 379 originally acert
I need help im half way on a 07 pete 379 originally acert put lower comp piston packs, switched harness to bxs 70 pin with repinned plug to 6nz and 70 pin ecm with 7cz file and motor works just no gau… read more
Justin
Justin
Diesel Technician
Vocational, Technical or Trade School
8 satisfied customers
I have a 2001 peterbilt 379 with a 64" sleeper and I cant
I have a 2001 peterbilt 379 with a 64" sleeper and I cant find the issue why my sleeper in the truck does not get power. The only time the power will work is if both the bunk and drivers side door is … read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
1996 Peterbilt 379 Vin 1XP-5DB8X-8-TN368732 Could you please
1996 Peterbilt 379 Vin 1XP-5DB8X-8-TN368732 Could you please get us the Engine cooing fan schematic for the auto and manual on off control switch… read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
I have a 2007 peterbilt 379 when I turn lights on and low
I have a 2007 peterbilt 379 when I turn lights on hi and low both on can not switch to low only then 3 seconds in high goes out and will not switch on thinking it is tripping spade breakers in fuse bo… read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
I have a 2004 Peterbilt 379. When the marker light switch is
I have a 2004 Peterbilt 379. When the marker light switch is turned on, cruise control shuts off along with it. Some of the marker lights will blink with the blinker as well.Also, the clearance lights… read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
I am looking for airline and wiring diagrams for a 2002
I am looking for airline and wiring diagrams for a 2002 Peterbilt 379, VIN *****************. Thanks… read more
Andrew G.
Andrew G.
Heavy Truck Mechanic
Heavy Duty Equipment - Truck and Transport Mechanic
4 satisfied customers
Jake brake stopped working on our 2002 Peterbilt 379. It's
Jake brake stopped working on our 2002 Peterbilt 379 … read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
We received fault code spn 1321 fmi 14. we are at the
we received fault code spn 1321 fmi 14. we are at the facility to deliver a load that is due at 6 am tomorrow morning and need assistance getting the truck started. please help … read more
Andrew G.
Andrew G.
Heavy Truck Mechanic
Heavy Duty Equipment - Truck and Transport Mechanic
4 satisfied customers
I have a 2006 379 C-15 Acert. You I have a 2006 379 C-15
When I turn the manual fan switch to "on", eventually the motor turns off, I then have to cycle the key ignition switch and the motor fires up and life is good....until I turn the manual fan switch again… read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
I have a 3406 in2003 Pete 379. No power to pin 21. Need to
I have a 3406 in2003 Pete 379. No power to pin 21. Need to know where it gets it's power from. … read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
I have a 1998 Peterbilt 379 with a 3406 engine in it. We
I have a 1998 Peterbilt 379 with a 3406 engine in it. We pressure washed the truck and engine bay recently. Ever since that we have been having the low water light come on in the truck. We have alread… read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
No cruise on 2005 peterbilt with c15, have et, cruise on/off
no cruise on 2005 peterbilt with c15, have et, cruise on/off works, clutch and brake switch both show off, but on et where it says cruise mode, it says not activated… read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
I have a 379 Pete, the jake does not work. I have no power
I have a 379 Pete, the jake does not work. I have no power to the jake brake switch. Is this my problem?? … read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
64 satisfied customers
I have a 2003 Peterbilt 379, with a 12.7 liter detriot. my
I have a 2003 Peterbilt 379, with a 12.7 liter detriot. my engine fan stays on and the engine fan light stays on , and the toggle switch in the dash will not turn it off. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
02 379 peterbilt with clearance light trouble. Last 6 of vin
Yes checked relays and plug that goes from firewall to trailer … read more
timdieseltech
timdieseltech
lead diesel tech, shop owner
Vocational, Technical or Trade School
213 satisfied customers
I'm switching a 99 peterbilt from Detroit ddec3 to cat 3406e
I'm switching a 99 peterbilt from Detroit ddec3 to cat 3406e 40 pin. What do I need for the cab. I have the harness from the ecm to the firewall from a donor truck. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
1994 Peterbilt 379 with 60 series Detroit diesel- The brake
1994 Peterbilt 379 with 60 series Detroit diesel- The brake lights only come on if I step on the brakes real hard. If I am using the brakes to slow down not stepping on them hard, they do not come one… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
214 satisfied customers
1994 357 peterbuilt have no traler brake lites no power coming
1994 357 peterbuilt have no traler brake lites no power coming out of cab were is fuse or relay dont see any in fuse block… read more
Toby
Toby
Vocational, Technical or Trade Scho
107 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.

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:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Daniel Wilson

Daniel Wilson

6,062 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

5,353 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

5,115 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,756 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

Curtis B.

Curtis B.

Technician

1,947 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

cumminsdr

cumminsdr

Mechanic

1,886 satisfied customers

All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

< Previous | Next >

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