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Technical Help with Column Drop switch wiring

Discussion in 'Traditional Hot Rods' started by NB141FD, Aug 7, 2022.

  1. NB141FD
    Joined: Apr 15, 2015
    Posts: 141

    NB141FD

    I am wiring a Model A coupe with a flathead V8, 12 volt negative ground system. The harness is a universal type (Speedway 12 circuit) with GM style plug-in column ignition. I would like to use a single wire start button like this:
    [​IMG]
    With a 1936 Column Drop Ignition Switch:
    [​IMG]
    The harness ignition instructions list the following ignition wires and their destinations:
    [​IMG]

    If I understand this correctly I would connect the Red Power wire to one post of the switch and both the Pink Coil wire and Brown Ignition wire to the other post. Does that sound correct?
    Also would I connect the purple Start wire to the start button? The button is grounded to the dash.
    What would I do with the Orange Accessory wire? There are no ACC terminals on the column drop switch. I am not running any radios, fuel pumps or wipers on this build.

    I posted on the Ford Barn but couldn't find anyone that had done this before. I was hoping that someone on the Hamb had wired their hot rod in this fashion. Thanks for any help you can offer.
    Tony
     
  2. i7083
    Joined: Jan 3, 2021
    Posts: 206

    i7083
    ALLIANCE MEMBER

    It looks like the purple wire probably goes to the starter solenoid. This wire should go to the ignition on side of the ignition switch, then to your push button. The other side of the button goes to the starter solenoid.
    Confused enough yet?
     
  3. badshifter
    Joined: Apr 28, 2006
    Posts: 3,588

    badshifter
    Member

    That looks like a late 40s to early 50s and beyond Ford door jamb switch That supplies ground when the door opens. Can you show a picture of the backside where the wire or wires connect to? A “ground when open” switch can be made to work with a relay but a two wire switch would be much easier.
     
    pprather likes this.
  4. 24riverview
    Joined: Jan 13, 2008
    Posts: 1,108

    24riverview
    Member

    Get a Standard Ignition SS587 starter relay/solenoid. This is the 12 volt version of what the flathead probably used to begin with. Connect a wire between your button and the small terminal on the relay, your starter will operate anytime though, ignition switch on or off. If going automatic run that wire through a neutral safety switch.
    If you want it to be ignition switch controlled you'll need to get a 2 wire starter button, different starter relay/solenoid also (not the SS587).
     
  5. This may help, using 2 wire button:
    StarterWiring.jpg
     
    RICH B likes this.
  6. NB141FD
    Joined: Apr 15, 2015
    Posts: 141

    NB141FD

    Thanks guys, yes I am confused. I have a 4 post 12 volt solenoid in place already. The button I have is an NOS that was used in 30's Fords. It has one wire and is grounded to the dash. If I can't use it then I am open to getting a 2 wire button but I really would like to verify that the one wire is unusable. My main questions have to do with the wiring to the ignition switch terminals. Once I get that squared away I can get onto the button. Thanks
     
  7. NB141FD
    Joined: Apr 15, 2015
    Posts: 141

    NB141FD

    Phil that is the solenoid I have mounted on the firewall.
     
  8. NB141FD
    Joined: Apr 15, 2015
    Posts: 141

    NB141FD

    I was given this wiring advice from a helpful poster on the Ford Barn:
    Using a relay:
    run the red wire to 30 on the relay and add a jumper to 85
    run a wire from one terminal on the ign switch to 86
    ground the other terminal on the ign switch
    connect the pink, brown, and orange wires to 87

    He also commented that I could use my single wire start button using another relay and wiring it as such:
    Connect 30 to one of the unused ign or acc circuits on your harness also jump to 85
    connect the purple wire to 87 and the other end to the S terminal on the starter solenoid
    connect the starter button to 86. Wired this way the starter will only work when the key is on.
     
  9. That seems like a lot of wiring stuff, to avoid buying a $12 two pole start button.
     
    RICH B likes this.
  10. j ripper
    Joined: Aug 2, 2006
    Posts: 856

    j ripper
    Member
    from napa ca.

    Do yourself a favor and build your own harness. A lot of nonsense in those universal kits for your application. And you’ll know the whole system which will help with troubleshooting down the road.
     
  11. j ripper
    Joined: Aug 2, 2006
    Posts: 856

    j ripper
    Member
    from napa ca.

  12. On the other hand, the first relay allows him to use the modern harness without overloading the simple brush contact in his stock ign switch and second permits him to use the starter relay he has already mounted as he requested.

    I shouldn't think the two relays are an overcomplicated approach to achieve his goal.

    For reference here are a couple sketches of the wiring.

    IMG20220808065027.jpg IMG20220808065006.jpg
     
  13. olscrounger
    Joined: Feb 23, 2008
    Posts: 4,815

    olscrounger
    ALLIANCE MEMBER

    ^^^This setup or similar--stock switch won't carry much load. Have done many this way
     
    RICH B, Hamtown Al and pprather like this.

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