Medium and Heavy Trucks

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Related Medium and Heavy Trucks Questions
Don't have no brake light on tractor or trailer,replaced the
Don't have no brake light on tractor or trailer,replaced the stop light switch,check all the fuses but still no brake light … read more
TomcM28
TomcM28
Owner
Associates
14 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
Cummins/Caterpillar Technician
Vocational, Technical or Trade School
2,881 satisfied customers
My marker lamps on my 2017 Peterbilt 567 are acting up. I do
My marker lamps on my 2017 Peterbilt 567 are acting up. I do not have any running lights on the back of the tractor, front fenders or in the headlight housing. Hi/lo beams as well as turn signals all … read more
Nich1019
Nich1019
Cummins/Caterpillar Technician
Vocational, Technical or Trade School
2,881 satisfied customers
We just bought a truck 16 389 peterbilt, things we noticed
We just bought a truck 16 389 peterbilt, things we noticed not working, roof lights, marker lights in headlight housing,along with no blinkers up front also, no taillights.. the headlights work on dim… read more
Nich1019
Nich1019
Cummins/Caterpillar Technician
Vocational, Technical or Trade School
2,881 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
Cummins/Caterpillar Technician
Vocational, Technical or Trade School
2,881 satisfied customers
I have a 2000 379 Peterbilt. When I bought it, the brake
I have a 2000 379 Peterbilt. When I bought it, the brake lights were not working. There's four wires coming from the tractor. I bought a light panel. Each side has three wires. I'm trying to figure ou… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
214 satisfied customers
Wher would relay be for marker light witch on 2007 peterbilt
Wher would relay be for marker light witch on 2007 peterbilt 379 … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
C15 code flashes 55 which I know it means no fault
C15 code flashes 55 which I know it means no fault codes..how do I get it to stop flashing..also when its flashing and set cruise. it will lock on speed and immediately start to accelerate...just as i… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
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Have 1992 379 peterbilt shop ecently replace old wiring.
Have 1992 379 peterbilt shop ecently replace old wiring. Everything dash signal all work but started down road everything goes out all dash everything trailer lights. Could it be ground or … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,756 satisfied customers
I'm taking turn signals off my headlights and putting blank
I'm taking turn signals off my headlights and putting blank covers there I took one off put cover on it now turn signal will not flash but will come on and be as bright as a marker light … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
My taillights on my truck quit. this includes the trailer
My taillights on my truck quit. this includes the trailer lights. All other lights are working correctly. I also want to mention that occasionally the taillights(LEDS) on both the truck and trailer wo… read more
Drue Casey
Drue Casey
Heavy Duty Diesel Mechanic
Vocational, Technical or Trade School
2010 386 Peterbilt no marker lights to the truck and trailer
2010 386 Peterbilt no marker lights to the truck and trailer except cab lights,when I put power. To wire it appears to be grounded at the switch have power on gray wires turn the switch on they go to … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
2000 PETERBILT 379, YOU ENERGIZE THE 304 CIRCUT ANYWHERE AND
2000 PETERBILT 379, YOU ENERGIZE THE 304 CIRCUT ANYWHERE AND MY LOW AIR ALARM TURNS ON AND ALL THE IDIOT LIGHTS TURN ON. THEY WILL NOT TURN OFF UNTIL CIRCUT 304 OR 242 ARE DEENERGIZED. I CAN GO TO LOW… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
Why do all the clearance lights come on and the headlights
Why do all the clearance lights come on and the headlights go to highbeam when just the headlight switch is switched on on my 03 peterbilt 379?… read more
William Herren
William Herren
A.A.S.
2 satisfied customers
I have a problem with a peterbilt tractor right blinker dies
I have a problem with a peterbilt tractor right blinker dies work when lights off when head lights and marker lights go on it stops blinking can i get some help please… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have a Peterbilt tractor 379 I installed LEDs my right
I have a Peterbilt tractor 379 I installed LEDs my right blinker will not work when the headlights are on. But works when I had lights off… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
MY 2000 379 PETERBILT QUIT RUNNING GOING DOWN THE ROAD. IT
MY 2000 379 PETERBILT QUIT RUNNING GOING DOWN THE ROAD. IT HAS A C-15 Catapiller motor which has A million miles on it.I think it is electrical because the speedometer and tach quit working as I coast… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
On a 2007 peterbilt wat wires do I need to disconnect from
On a 2007 peterbilt wat wires do I need to disconnect from the headlight switch so jus the headlights com on an not the marker lights .… read more
Wayne
Wayne
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Vocational, Technical or Trade Scho
5,115 satisfied customers
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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.

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

cumminsdr

cumminsdr

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All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

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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.

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