Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Recommended Posts

Posted (edited)

I have a 2017 Chevy Silverado 3500 HD High Country with 6.6 diesel equipped with tow package.  It has dedicated trailer brake and trailer fuses within the primary fuse box under the hood.  My passenger side trailer blinkers and brake lights are not working.  I've traced the lack of 12v power all the way up to the 10a fuse dedicated to the right side trailer brake/signal light (fuse #17).  I have replaced the fuse, re-tested, and still no power.  The left side trailer brake/signal light (fuse #14) has 12v power going to it, tested on the top of the fuse when the flashers are on, but the right side has nothing.  I've also swapped and then replaced the trailer parking lights relay switch (relay #63) and still nothing.  Is this most likely an issue with fuse box or something else supplying power or ground to the fuse box?  Thanks for the help... this is the craziest thing.

Edited by jkrosky

Share this post


Link to post
Share on other sites

Turn Signal Lamps

For turn signal lamp operation, the left and right trailer stop/turn signal lamp relay’s are supplied with battery voltage at all times. Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START positions. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM responds to the turn signal switch input by applying a pulsating voltage to the left and right trailer stop/turn signal lamp relay control circuits energizing the relay’s in an ON and OFF cycle. With the left and right trailer stop/turn signal lamp relay’s energized, the relay switch contacts cycle ON and OFF applying battery voltage through the left and right trailer stop/turn signal fuse’s to the trailer turn signal lamp control circuits which illuminates the trailer turn signal lamps in an ON and OFF cycle.

Maybe the fuse relay center, check for power at the relay.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Similar Content

    • By Ricky Harper
      I have a 2010 Chevy Silverado 1500 2 wheel drive 4.3l v6 and the transmission went out yesterday. I was wondering what transmissions are interchangeable with my truck. Please help. 
    • By David Gethers
      I recently purchased a '17 Silverado Hd 2500 Duramax, and I swear it has been back to the dealer more than I've had ( exaggeration ). But more recently I have developed
      the same issue with hard vibration at highway speeds, feeling like the steering wheel is about to come free. I literally just got the truck back yesterday , only to find out that they
      pretty much just let my vehicle sit for two days while they did nothing to it at all.  I brought the mechanic out for a ride, bc they state they can't reproduce the issue. 
      Took the guy out on I-95 and punched it.. ( frustration ) , within a second, the steering wheel was all over the place. The mechanics reaction was to say that was normal....
        I called my fleet mechanic, said he knows what the issue is , and will order the new gearbox .... If GM knows of this issue, Why are dealerships so difficult to get to do the work?
         ( Delray Buick Gmc )
    • By Gorehamj
      John Goreham
      Contributing Writer, GM-Trucks.com
      9-11-2019
       
      General Motors has announced that NHTSA is mandating a safety recall for the following vehicles:
      2014-2018 Chevrolet Silverado and GMC Sierra Pickups (1500 / 2500 / 3500) 2015-2018 Chevrolet Suburban, Tahoe, GMC Yukon vehicles  2015-2017 Cadillac Escalade  
      NHTSA reports that the amount of vacuum created by the vacuum pump may decrease over time. The group says that as the vacuum level drops, the brake assist decreases, and that this increasing braking effort, extending the distance required to stop the vehicle, thereby increasing the risk of a crash. This new recall covers 3.4 million vehicles. 
       
      The Problem: The brake pump uses engine oil to lubricate itself. If the pump becomes clogged with engine oil sludge the units ability to create vaccum is diminished over time. As a result, braking force and ability also drops. The issue is usually accompanied by a "Service Brake Assist" warning message in the dash. 
       
      The Fix: GM will reprogram the computer that controls the secondary brake assist pump. The secondary pump will now activate at lower speeds and different situations quicker to compensate for any lost output from the main pump. Since the pumps are not failing, GM has decided not to replace them.
       
      GM's number for this recall is N192268490. In compliance with federal law, GM will notify owners, typically by snail mail. GM says that its dealers will reprogram the Electronic Brake Control Module. However, GM has not yet provided a notification schedule. Owners may contact Chevrolet customer service at 1-800-630-2438, Cadillac customer service at 1-800-458-8006 or GMC customer service at 1-800-462-8782.
       
      If you own one of these vehicles and wish to check to see if your vehicle is included (or not) you can do so at this link immediately.
       
      As with every safety recall, customers will not be charged by GM for the needed repairs or modifications. 
       
      NHTSA's public information on this issue indicates that many accidents have been reported to NHTSA including some with injuries. This recall is the result of a NHTSA investigation that lasted nearly a year. In its investigation report, NHTSA noted the following details about the problem:
       
       
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Forum Statistics

    210,628
    Total Topics
    2,258,419
    Total Posts
  • Member Statistics

    181,506
    Total Members
    8,960
    Most Online
    kennyf1585
    Newest Member
    kennyf1585
    Joined
  • Who's Online   21 Members, 0 Anonymous, 740 Guests (See full list)

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.