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2018-2019 MSD 2-step install.

Discussion in 'Dragstrip and Launching' started by Hyper771987, Jun 30, 2019.

  1. Hyper771987

    Hyper771987 Well-Known Member

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    Gentleman,

    My car - 2019 Mustang GT Automatic.

    I have purchase the MSD-87311 2- step, and I have a few questions in regards to the install.

    I have an automatic so I’m going to tap in to the brake light switch located in the brake pedal. Does anyone know which wire that is?
    - I will be using the MSD 12v activation signal wire, blue/white wire.

    Since it’s an 18-19 I was told to switch the #3 cylinder wires. Is that done on the harness side (before the MSD box) or on the coil pack side (after the MSD box)?.

    Does it matter which way I install the main harness?... run the harness behind the engine or in front?... the instructions didn’t specify.

    Thank you for the help !
     
  2. bigwill90

    bigwill90 Well-Known Member

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    Bump I have this also and have the same question.
     
  3. Jetnoise

    Jetnoise Well-Known Member

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    Does MSD / Holley offer any support for your application?
    Looks like they have a few brands
    Never called any of them before except before Holley bought out the bg demon stuff. IMG_1089.PNG
     
  4. OP
    OP
    Hyper771987

    Hyper771987 Well-Known Member

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    Tested all the wires in the brake switch harness and they all have between 10-12v going through them. Going to find a 12v source on the brake light, if that doesn’t work then I’m going to a momentary switch.
     
  5. olaosunt

    olaosunt Well-Known Member

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    Any updates ?
    Were you able to make it work and figure out which wires to switch ?
     
  6. Nos-pete

    Nos-pete Well-Known Member

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    I have it installed on my 18 GT I will crawl under there this evening and take a pic and post to show brake wireing and if you like under hood as well?
     
  7. bigwill90

    bigwill90 Well-Known Member

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    What did u do about the #3 cylinder coil ???
     
  8. pro 5.0

    pro 5.0 Well-Known Member

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    I believe you need to reverse the polarity on coil # 3.
     
  9. bigwill90

    bigwill90 Well-Known Member

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    @ the MSD box rite ?
     
  10. pro 5.0

    pro 5.0 Well-Known Member

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    I would call MSD for verification but I believe you do it at the coil connector itself.
     
  11. turnswrench

    turnswrench turnswrench

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    #11 turnswrench, Oct 7, 2019
    Last edited: Oct 8, 2019
    I posted instructions in my build thread for future reference.
     
  12. OP
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    Hyper771987

    Hyper771987 Well-Known Member

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    I finally got to work by watching a video a guys made in FB.

    Hooked up the 2 step and then a 3 relay trans brake. Botch activases by a steering button I got from Motion race works.
     
  13. bigwill90

    bigwill90 Well-Known Member

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    You have a link to this Facebook post ?
     
  14. nicolasfinta1

    nicolasfinta1 Well-Known Member

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    Anyone have the video on how I’m thinking about getting it on my 2018 A10 but am so confused on how
     
  15. turnswrench

    turnswrench turnswrench

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    I have information in my build thread.
     
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