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Is it possible to use a 6v positive ground....

Discussion in 'The Hokey Ass Message Board' started by turboroadster, Feb 23, 2014.

  1. and then use a step up transformer to 12v and then use the stock distributor point set to trigger a GM HEI module that I can mount on an aluminum heat sink somewhere and get the benefits of the electronic ignition?

    This is on my 51 plymouth cranbrook flat 6. Its a 6 volt positive ground car.
    I have a new in box 12 v harness and I might be better off just spending the few days or so to install it and convert the car to 12 volt neg. ground, but was basically hoping to not have to do a wiring harness install right now.
     
  2. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,357

    Hnstray
    Member
    from Quincy, IL

    You can convert your car to negative ground without installing a new wiring harness. You can convert your car to 12 volts without replacing the harness, PROVIDED the existing wiring in in sound condition. 12 volt system use half the amperage required by 6 volt systems and the 6 volt wiring is heavier to carry the higher load.

    To change from + to - almost everything functions just fine with the reversed polarity.
    IIRC correctly, you need to swap connections on the ammeter to have the needle swing in the correct direction, I think coil connection need to be reversed, the generator needs to be correctly polarized . I am unsure about the voltage regulator. I do not know if it will function correctly with reversed polarity.

    No doubt others will contribute to this thread and can answer the latter question.
     
  3. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,756

    Rusty O'Toole
    Member

    I get what you are driving at but doubt it is practical. You can't transform DC only AC. So you would have to turn your DC to AC, step it up, and turn it back into DC. Can be done but why bother.

    There are 6V electronic ignitions from Pertronix and possibly Mallory if they still make them.

    If you don't like Pertronix the easiest solution is to leave it stock. The stock ignition is reliable and only needs attention every 10,000 miles or so.
     
  4. Wilf13
    Joined: Aug 30, 2010
    Posts: 93

    Wilf13
    Member

    Does your car have the M6 semi automatic that shifts electro-hydraulically and is that the reason why you want to keep the car 6V throughout?
     
  5. no, the car is a 3 speed standard, really, no good reason not to go ahead and install the harness I bought a few months back besides laziness and she runs and drives and its the season to enjoy the drive......but, if she misses and sputters like she did yesterday a long way from home, gggrrrrr, anyways, today I cleaned and reset points and timing and she purrs again for the time being.
     
  6. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,756

    Rusty O'Toole
    Member

    Your ignition may not be up to spec. After a tuneup, should run flawlessly for 10,000 miles or more.

    Were the points burned? If so, your condenser is probably bad. Old condensers are no good, they go bad just sitting on the shelf.
     

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