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86 FLC120 engine brake

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by MattW94, Mar 21, 2019.

Page 2 of 3
  1. Mar 22, 2019 #11
    Freightliner Classic

    Freightliner Classic Light Load Member

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    have u took the vaulve cover off to see if they are hooked up
     
    Freightliner Classic, Mar 22, 2019
    Freightliner Classic, Mar 22, 2019
    #11
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  3. Mar 22, 2019 #12
    MattW94

    MattW94 Bobtail Member

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    Yes. Put new gaskets on a month or so ago and they were then
     
    MattW94, Mar 22, 2019
    MattW94, Mar 22, 2019
    #12
  4. Mar 22, 2019 #13
    Freightliner Classic

    Freightliner Classic Light Load Member

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    Rome GA
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    i dont know
     
    Freightliner Classic, Mar 22, 2019
    Freightliner Classic, Mar 22, 2019
    #13
  5. Mar 22, 2019 #14
    Freightliner Classic

    Freightliner Classic Light Load Member

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    The Switch good
     
    Freightliner Classic, Mar 22, 2019
    Freightliner Classic, Mar 22, 2019
    #14
  7. Mar 22, 2019 #15
    MattW94

    MattW94 Bobtail Member

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    May not be. I may try that next. The hot wire coming from the switch goes to the fuel gauge. I thought they needed to go to the ignition but I’m not sure
     
    MattW94, Mar 22, 2019
    MattW94, Mar 22, 2019
    #15
  8. Mar 22, 2019 #16
    Freightliner Classic

    Freightliner Classic Light Load Member

    108
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    Rome GA
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    Could be
     
    Freightliner Classic, Mar 22, 2019
    Freightliner Classic, Mar 22, 2019
    #16
  9. Mar 22, 2019 #17
    Tombstone69

    Tombstone69 Road Train Member

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    There's also a switch on the clutch.You should have power going to the dash switch, if you don't have that you have to trace that wire back to the source, all the switches closed, completes the circuit, gives you the Jake.
     
    Tombstone69, Mar 22, 2019
    Tombstone69, Mar 22, 2019
    #17
  10. Mar 22, 2019 #18
    MattW94

    MattW94 Bobtail Member

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    Mar 21, 2019
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    So one thing I noticed is there are 3 jakes. One on each valve cover but where they run to the plug there is only 2. Do 2 of them tie together or is one of the cut wires to one of the jakes?
     
    MattW94, Mar 22, 2019
    MattW94, Mar 22, 2019
    #18
  11. Mar 22, 2019 #19
    Dino soar

    Dino soar Road Train Member

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    1553281170716750954221612543937.jpg

    Here is a jake brake wiring diagram.

    Follow your wiring and test for electricity beginning at number one.
     
    Dino soar, Mar 22, 2019
    Dino soar, Mar 22, 2019
    #19
  12. Mar 22, 2019 #20
    xsetra

    xsetra Road Train Member

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    xsetra, Mar 22, 2019
    xsetra, Mar 22, 2019
    #20
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