Train horns kill my cruise control!!

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by SemperFiServices, Aug 19, 2020.

  1. SemperFiServices

    SemperFiServices Medium Load Member

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    This weekend I installed my Nathan K3LA locomotive horns on the crossmember just behind the cab of my 2015 Prostar, facing backward. I ran the 1/4" air line from the electric solenoid, to a brake relay valve I have on an additional 8 gal air tank I mounted under the cab, which goes to the horn via 1/2" air line. So the horn works just like stock, but a helluva lot louder.

    But when my cruise is set, and I hit the horn, my dash lights up with the triangle, abs, and traction control lights, and that combination always kills your cruise until you shut the truck off for 5 mins.

    So any idea why it's doing this? I added the 3rd tank so I wouldn't drain the primary or secondary tanks, but the 3rd tank feed is directly off the air dryer, so I don't know if the sudden drop in only a few psi is causing the abs to trip up ir what? I don't run around like an ####### blowing my horn for fun either, I just want my darn cruise to work right. I'd appreciate any advice y'all can offer!
     
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  3. Chinatown

    Chinatown Road Train Member

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    Maybe something like when there's a loud thunder during a storm or loud fireworks, that set off car alarms all over the neighborhood.
    Vibrations or recoil from the train horn you have.
     
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  4. SmallPackage

    SmallPackage Road Train Member

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    I’d guess the noise and vibration is interfering with the speed sensor on the tranny. By your discription it sounds like those horns are mounted close to it.
    Just a suggestion since train horns are kinda considered by some to be illegal. Power them by a seperate switch or valve than the factory ones so you don’t hit them during an inspection. Trooper may make you remove them and give a ticket for in operable factory horns.
    I love train horns and have them hidden on all my trucks but I have them as a seperate accessory. Cya!
     
  5. Goodysnap

    Goodysnap Road Train Member

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    You lost me at International and train horns? Is that even legal.......?


    Just out of curiousity what faults are logging in the ABC/TCS system? I would start there.
     
  6. lwlevens

    lwlevens Medium Load Member

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    If it keeps up ace the horn easy fix!!!
     
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  7. StrokerTSi

    StrokerTSi Medium Load Member

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    Probably cause you sourced the air line from the brake relay valve and a sensor senses an unexpected drop in line pressure.
     
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  8. buddyd157

    buddyd157 Road Train Member

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    'bout as legal as aircraft landing lights?
     
  9. not4hire

    not4hire Road Train Member

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    Sounds like a similar problem cousin Eddie has...

     
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  10. Final Drive

    Final Drive Road Train Member

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  11. Brettj3876

    Brettj3876 Road Train Member

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    Haha thanks I needed a good laugh and almost spilt coffee on my nards
     
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