Medium and Heavy Trucks

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Related Medium and Heavy Trucks Questions
1999 Kenworth T800 Red Trailer supply valve wont stay in
1999 Kenworth T800 Red Trailer supply valve wont stay in when i push it. It pushes right back out. New dash valve lines are not crossed. Checked all other valves it still happens. Disconnected Emergen… read more
BrentR718
BrentR718
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Brake lights on trailer do not work, but on truck they do.
Brake lights on trailer do not work, but on truck they do. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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I have a 2005 KW T800. The trailer brake lights do not work,
I have a 2005 KW T800. The trailer brake lights do not work, but they work on the truck. Sometimes there is a buzzing sound in the cab and the lights go dim… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
4,737 satisfied customers
I have a 2002 Kenworth w900b that trailer brake lights are
I have a 2002 Kenworth w900b that trailer brake lights are not working, they are however working on the truck. I did some diagnosing myself ruling out a bad pigtail or a blown fuse in the panel, after… read more
Wayne
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Vocational, Technical or Trade Scho
4,023 satisfied customers
I am working on a 2015 kenworth T800, The trailer stop
Hello, i am working on a 2015 kenworth T800 , The trailer stop lights are not working, Fuse and relay is activating as it should. Performed ohm test to pig tail and connectors and its good. I am looki… read more
Daniel Wilson
Daniel Wilson
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07 Kenworth T800 left turn lamps stay on solid on the left
07 Kenworth T800 left turn lamps stay on solid on the left fender and the trailer but not the rear of the tractor. … read more
Bradey V
Bradey V
Certificate
Heat's not working on air drain system. Kenworth 2000 T800.
Yes. Why no power to why no power to heater system on air dryer … read more
Wayne
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Vocational, Technical or Trade Scho
4,023 satisfied customers
Brake lights on trailer don't work but everything else does.
Brake lights on trailer don't work but everything else does … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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2012 peterbilt 388 ..brake lights work on the truck ..all
2012 peterbilt 388 ..brake lights work on the truck ..all lights work on the trailer except brakelights ..theres no power to the red wire coming from the truck to the socket you hook yout trailer pigt… read more
Wayne
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Vocational, Technical or Trade Scho
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1988 Kenworth T800 blowing a fuse everytime I turn the right
1988 Kenworth T800 blowing a fuse everytime I turn the right directionals … read more
Wayne
Wayne
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Vocational, Technical or Trade Scho
4,023 satisfied customers
2013 389 - i have no power on the center pin for the abs
2013 389 - i have no power on the center pin for the abs with the key on. The fuses under the drivers dash are good. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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I have a 07 freightlinerclassic xl, im having issues with
Hi Steve I have a 07 freightlinerclassic xl, im having issues with the wiring that supplies the trailer power, my issues are as followed when right turn signal is on the left center light flashes to, … read more
Jeremy
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Associate Degree
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Its a 2008 kenworth dump truck. 2008 kenworth t800 dump
its a 2008 kenworth dump truck JA: What is the make/model of your car? Customer: 2008 kenworth t800 dump truck JA: Are you fixing your vehicle yourself? What have you tried so far? Customer: brake lig… read more
Wayne
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I'm working on a 2013 kenworth t800. I have turn signals on
I'm working on a 2013 kenworth t800. I have turn signals on the tractor but not the trailer. I have no power to the 7 way plug from the PDM. All other lights working fine. All fuses are good and none … read more
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Daniel Wilson
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I had no power to light cited for trailer brake lights.
I had no power to light cited for trailer brake lights. Found a break in write on harness where they looted it over frame. Fixed that but still no lights. Can power wire and they light up. Relays and … read more
Wayne
Wayne
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Vocational, Technical or Trade Scho
4,023 satisfied customers
2000 kenworth w-900. Brake lights on tractor but not on
2000 kenworth w-900. Brake lights on tractor but not on trailer. I checked the tractor pigtail and have no power,traced wires back in the loom and found nothing suspect. Fuses all ok too. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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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
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2004 t800 brake lights on truck work. here relay click when
2004 t800 brake lights on truck work. here relay click when brakes applied. no power or ground on trailer brake fuse circuit… read more
Jim
Jim
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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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