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When i turn on the left signal light the brake light on the…

Customer Question
When i turn on...

When i turn on the left signal light the brake light on the truck and trailer comes on

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Truck Mechanic I'm going to connect you with knows all the tricks and shortcuts.

Thx

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

Yes i have checked the trailer plug with a tester and i have the green light flashing for the stop lights when left turn signal is on

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

2011 peterbuilt 389

Submitted: 6 months ago.Category: Medium and Heavy Trucks
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Answered in 8 hours by:
1/9/2018
Technician: Jeremy, Certified Truck/Bus Technician replied 6 months ago
Jeremy
Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3,786
Experience: ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician
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My name is ***** ***** I will assist you with your question today.

I'm an independent contractor and I don't get paid until a rating has been made.

We can go back and forth as needed to help resolve the issue you are having. Follow ups are free after ratings, so rate in confidence!

Have you checked the pigtail at the back of the truck, where the pigtail plugs in, to see if the same issue is there to rule out a pigtail issue? If not, check there for it can backfeed the truck rear lights.

Otherwise, go to the passenger side of the truck, under the hood. There is a large harness coming out of the firewall. Wiggle it and see if the issue remains. If it is intermittent, you have a short there. If it remains, then there is an issue with the module and the module needs to be scanned with a computer to see if it is internally faulting out. The lights are module fed on that truck.

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Jeremy

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Technician: Jeremy, Certified Truck/Bus Technician replied 6 months ago

I see you viewed this and this is still showing as an open question due to no positive (3 stars or more) rating.

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Jeremy
Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3,786
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Experience: ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician

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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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