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3406B Cat Jake Break & Retarder wiring

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by bctrucking2017, Jan 8, 2023.

Page 2 of 2
  1. Jan 9, 2023 #11
    wore out

    wore out Numbered Classic

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    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
    0
    With power tuning from the fuel switch to switch on the dash the same switch will control both. The connection to the Jake switch and retarder switch should have a jumper
     
    wore out, Jan 9, 2023
    wore out, Jan 9, 2023
    #11
    Oxbow Thanks this.
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  3. Jan 9, 2023 #12
    bctrucking2017

    bctrucking2017 Bobtail Member

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    Jan 8, 2023
    0
    Changed wiring around like you suggested, starting Hot at the clutch switch, to the fuel switch. then to the dash & back to the jakes. Jumper wire at dash to retarder switch…. Works great, Jake or Retarder or both !!!! Thanks a million Now just need to figure out how to reset fuel pump Jake Switch. Somehow got knocked out of ajustment?
     
    bctrucking2017, Jan 9, 2023
    bctrucking2017, Jan 9, 2023
    #12
    Oxbow and wore out Thank this.
  4. Jan 10, 2023 #13
    wore out

    wore out Numbered Classic

    16,037
    194,226
    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
    0
    Just has a jam nut that’s also your low idle set screw. If it just quit working or went to intermittent after fooling with it it’s gonna need replaced they are a bit flimsy
     
    wore out, Jan 10, 2023
    wore out, Jan 10, 2023
    #13
    Coffey, Last Call and Oxbow Thank this.
  5. Jan 11, 2023 #14
    Inderjit

    Inderjit Heavy Load Member

    724
    708
    Sep 17, 2017
    0
    The Jake brake and the retarder on a 87 Kenworth were all controlled by relays in the
    fuse panel. It sounds like someone has been in there and modified the wiring. Might
    be an idea to see if you can get a diagram for the truck.
     
    Inderjit, Jan 11, 2023
    Inderjit, Jan 11, 2023
    #14
  7. Jan 11, 2023 #15
    bctrucking2017

    bctrucking2017 Bobtail Member

    7
    5
    Jan 8, 2023
    0
    Thanks, stoped by Cat the other day when I was in town. Talked to truck shop guy. He got me dialed in on setting the fuel pump Jake switch. I was under the impression that you could set the sensitivity of when Jake came on & off with it like on old Cummins motor. He explained all you do is set the idol with switch screw in, Jake on/off is predetermined in switch……..!
     
    bctrucking2017, Jan 11, 2023
    bctrucking2017, Jan 11, 2023
    #15
    Oxbow and wore out Thank this.
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