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Need help from the brain trust that is the "Beeb" - GMC Sierra 3500HD blinker issue

Discussion in 'General' started by Evad101, May 3, 2023.

  1. pickled egg

    pickled egg There is no “try”

    Cuz it needed the money

    cav115 likes this.
  2. pickled egg

    pickled egg There is no “try”

    Stories from the That Really Happened files…

    Yesterday I spent a couple hours helping a friend diagnose a parasitic draw in a 2004 Yukon. Guarandamnteed the battery would be dead every morning.

    Disconnected the hyooj terminal block off the underhood fuse panel and the draw disappeared.

    Amp clamp wouldn’t register any draw :mad: so we ended up using a test light and manually connected every. single. terminal one at a time to see what was pulling load.

    OnStar module was one.

    Transfer case control module was another.

    Disconnected the OnStar, cuz, you know, fuck OnStar, and tossed a used TCCM on to test.

    This morning the truck had a charged battery and started right up.

    That’s how much of a cunt these things can be. He had to walk away from the troubleshooting before he asked me for help because he was ready to test some Tannerite with it.
    cav115 likes this.
  3. cav115

    cav115 Well-Known Member

    That is correct.... but many times the symptom does not repeat.

    I did not say that was the final solution...it`s a beginning of diagnostics. And if if it does not repeat, there is no further checking until the problem is active. If, the fuse is open....:D
  4. Evad101

    Evad101 Well-Known Member

    Fuse is good. Will continue to troubleshoot the wiring this weekend.
    cav115 likes this.
  5. WillMill

    WillMill CRA MN #633

    Was there any maintenance recently done? Or anything happen to the truck unrelated? Anything aftermarket wired in? Aftermarket taillights or bulbs?
  6. Evad101

    Evad101 Well-Known Member

    Nope, standard use which is very little, bone stock, no mods. The truck sits a lot as I work from home. Have owned it since 2018 and only put 30k miles on it.

    At this point, I have to think its a corroded connection or something wiring related. I will be digging in to trace the wires until I find the source of the issue. Fun time I am sure...
  7. pickled egg

    pickled egg There is no “try”

    As a dyed in the wool do-it-yerself’er, it pains me to say this but time/expense might best be mitigated by spending a bit of coin at the stealership, they can plug in and test the circuits with a fuckload more efficiency.
    Evad101 likes this.
  8. TWF2

    TWF2 2 heads are better than 1

    Maybe mice made nest somewhere in there and was pissed wire passing through his house.
    Murcielago311 and Evad101 like this.
  9. WillMill

    WillMill CRA MN #633

    Id drop the spare tire, and crawl under the box. That wiring is pretty open back there. Clean up all the grounds, and look for broken wires. Id put my money on a bad ground, or a dirty plug.
    Evad101 likes this.
  10. Evad101

    Evad101 Well-Known Member

    You have a point and im getting close to this

    This did happen to my brothers truck that sits as well. His is in a barn though and mine is out in the open with nothing around it sitting on a gravel driveway. I do use it at least once a week for short hardware store, go shootin', etc, trips and have not seen any evidence of mice but wouldn't hurt to further investigate.

    That's my next step, the tail light harness junction box is up just next to the spare making it difficult to access. Dropping the spare will make it easier for sure. Looks like I am getting dirt in my eyes today laying on my back under the truck! Where did I put those safety goggles?!!?o_O
  11. cav115

    cav115 Well-Known Member

    Are there any codes? This circuit involves the BCM.

    Not sure how familiar you are with automotive; do you have a wiring diagram?

    If you are not, you might consider a competent technician or as said, the dealer.
  12. tawzx12r

    tawzx12r Influencer to none

    Remove the Tee at the hitch plug and see if the issue goes away.
  13. Evad101

    Evad101 Well-Known Member

    Solved, wire was broken in the bulb connection that was difficult to locate. New sub harness, issue resolved.
    JBall, quikie and pjdoran like this.
  14. skidooboy

    skidooboy supermotojunkie

    Glad you figured it out. Thank you for following up, that you found the cure, and what it was. Many times forum people ask for help, fix it, then never say what the outcome was. This helps others, with similar problems. Ski
    Evad101 likes this.
  15. 05Yamabomber

    05Yamabomber Dammit Haga

    What about the side mirror blinker? I bought aftermarket led side mirror blinkers and it failed after 4 months. Causing the fast blink and I couldnt find it at first.

    Thats all I got for ya!
  16. Hyperdyne

    Hyperdyne Indy United SBK

    My turn.

    2019 RAM 2500. All the signals and brake lights work as they should. When I hook up any trailer, the driver's side turn signal doesn't flash on the trailer. Again everything works as it should, except the driver's side turn signal. Brake light, running light, etc all work. But no blinker.
  17. 05Yamabomber

    05Yamabomber Dammit Haga

    Sounds like a wiring difference on the trailer. Sometimes they wired differently. I went to a trailer/RV place and they had a tester to plug into my cannon plug and could tell me the wiring compatibility.

    Or could be a bad connection in the plug. Clean and die-electric grease.
    Evad101 likes this.
  18. Evad101

    Evad101 Well-Known Member

    I'm dealing with a trailer light issue now but I know its the truck as it does the same thing on 2 different trailers. I get very weak running lights. Brake lights, blinkers hazards all work but the running lights are very dim. I believe I may have a bad ground. My next step is I am just going to replace the trailer light plug sub harness on the truck. Its well worn and has been pull out of its normal secure position.
  19. wsmc42

    wsmc42 Well-Known Member

    Why do GM trucks and Toyotas continually have a bulb out? With GM it is usually the left. And many times it is a new or nearly new vehicle. I'm not trying to start a brand war, but it is just something I notice alot on the road.
  20. Woofentino Pugr

    Woofentino Pugr Well-Known Member

    You mean the DRL's? On GM trucks is because the voltage spikes take the bulbs out. Usually caused by the socket getting rusty. Pull bulbs, put dielectric grease in the socket and put bulb back in. Stops the issue.
    Evad101 likes this.

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