Register now to get rid of these ads!

Hot Rods Electronic Ignition Question

Discussion in 'The Hokey Ass Message Board' started by 41 C28, Oct 23, 2020.

  1. 41 C28
    Joined: Dec 17, 2005
    Posts: 1,772

    41 C28
    Member

    Anyone have experience running electronic (Pertronix) ignition in a 12 volt positive ground system with a generator? Thanks
     
  2. gene-koning
    Joined: Oct 28, 2016
    Posts: 2,027

    gene-koning
    Member

    You will probably get a better response from these guys if you change your title to "Pertronix ignition question" rather then electronic ignition question. Most here will not open up an electronic ignition thread.
    I can't help much on the Pertronix system, but normally electronic ignition systems like to have a consistent 12 volts, something many generators can't do at an idle with lights on.
     
    lothiandon1940 likes this.
  3. Truck64
    Joined: Oct 18, 2015
    Posts: 4,148

    Truck64
    Member
    from Ioway

    Sometimes you'll hear that the Pertronix won't work reliably with a generator charging system. Nobody has informed my Ignitor I though, it hasn't ever missed a spark in 20 years. Positive ground I've no experience with. Shouldn't be a show stopper?
     
    Truckdoctor Andy likes this.
  4. Mike VV
    Joined: Sep 28, 2010
    Posts: 2,062

    Mike VV
    Member
    from SoCal

    Have you...say...called or e-mailed Pertronix ?
    THAT...would be a MUCH better place to ask your question vs. asking here.

    Mike
     

  5. Most DC electronics are polarity-sensitive, all it would take is one diode somewhere in the circuitry to prevent it from working. I'd be less concerned with the use of a generator, although they don't put out as 'clean' power like an alternator, so that could be an issue at lower speeds.
     
    VANDENPLAS likes this.
  6. Driver50x
    Joined: May 5, 2014
    Posts: 118

    Driver50x
    Member

    It seems like it would work fine as long as you hook the wires up “backwards”. I’ve never done it though. I’m just thinking out loud.
     
    VANDENPLAS likes this.
  7. alphabet soup
    Joined: Jan 8, 2011
    Posts: 1,419

    alphabet soup
    ALLIANCE MEMBER

    I herd about a lot of them used on Pos. ground tractors with no problem. If that helps at all. Gene.
     
    lothiandon1940 likes this.
  8. I have a Pertronix on a 1959 International Cub LoBoy with a six volt positive ground system. Works perfectly, and it has for five or six years. This tractor is used constantly for mowing at our farm. The connections for positive ground are a little different than negative ground, but read the instructions and make sure to get the correct coil.


    Sent from my iPhone using The H.A.M.B. mobile app
     
  9. KenC
    Joined: Sep 14, 2006
    Posts: 474

    KenC
    Member

    Curious here: what vehicle are you working on? I've never encountered a 12v, positive ground.
     
    Boneyard51 likes this.
  10. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,143

    Ebbsspeed
    ALLIANCE MEMBER

    ^^^^^ DON'T do this. ^^^^^

    In 1955 the Packard was a 12 volt positive ground vehicle.
     
    Last edited: Oct 24, 2020
    VANDENPLAS and Truckdoctor Andy like this.
  11. jimmy six
    Joined: Mar 21, 2006
    Posts: 7,146

    jimmy six
    Member

    So do English cars up in to the 60’s
     
    VANDENPLAS likes this.
  12. Boneyard51
    Joined: Dec 10, 2017
    Posts: 4,360

    Boneyard51
    Member

    All Fords were positive ground from the beginning to somewhere in the late forties or early fifties.





    Bones
     
  13. Truck64
    Joined: Oct 18, 2015
    Posts: 4,148

    Truck64
    Member
    from Ioway

    Well no, the Model T was negative ground.
     
    Boneyard51 likes this.
  14. Boneyard51
    Joined: Dec 10, 2017
    Posts: 4,360

    Boneyard51
    Member

    Oh, I never messed with Ts, I know ole Henry liked the positive ground system. My 1937 Ford is positive ground. I just figured Henry started with positive. When did Ford change to positive ground and when did they change back to negative ground? I know early Ford tractors are positive ground. Thanks for the correction..








    Bones
     
    Last edited: Oct 24, 2020
    VANDENPLAS likes this.
  15. Truck64
    Joined: Oct 18, 2015
    Posts: 4,148

    Truck64
    Member
    from Ioway

    Seems to me the Model A was positive ground, and pretty much everything remained so until 1956.
     
    jimmy six and Boneyard51 like this.
  16. Boneyard51
    Joined: Dec 10, 2017
    Posts: 4,360

    Boneyard51
    Member

    Well, I’m pertty sure my 55 Ford was negative ground, it was six volt, I know for sure, because I converted it to 12 volt, when I put a 430 MEL in it. But I remember it as negative ground. But that was over fifty years ago when I did that! Lol






    Bones
     
  17. Truck64
    Joined: Oct 18, 2015
    Posts: 4,148

    Truck64
    Member
    from Ioway

    Well you'd know better 'n me. Heck, I wasn't even "supposed to be a backrub" in 1956!
     
    VANDENPLAS, Budget36 and Boneyard51 like this.
  18. 41 C28
    Joined: Dec 17, 2005
    Posts: 1,772

    41 C28
    Member

    1955 Packard Super Clipper
     
    Boneyard51 likes this.
  19. KenC
    Joined: Sep 14, 2006
    Posts: 474

    KenC
    Member

    Negative with 12v,
     
    Boneyard51 likes this.
  20. blowby
    Joined: Dec 27, 2012
    Posts: 6,872

    blowby
    Member
    from Nicasio Ca

    Pertronix kits for positive ground have a P suffix in the part no. iirc.
     
    Boneyard51 likes this.
  21. Boneyard51
    Joined: Dec 10, 2017
    Posts: 4,360

    Boneyard51
    Member

    Well, I went to my faithful I pad and checked on the wiring of Fords and it appears that the change to negative ground occurred shortly after WWII. But I did find where the 1948 Ford pick up was positive ground. But the 55 Ford car is definitely negative ground.








    Bones
     
  22. jimmy six
    Joined: Mar 21, 2006
    Posts: 7,146

    jimmy six
    Member

    When I was a battery line installer at Sears from 62-65 I remember Fords up thru 55 were positive ground 6 volts but that was a long time ago....
     
    Boneyard51 likes this.

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.