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Thread: changing over to a 12 volt altenator

  1. #1
    Join Date
    Aug 2006
    Location
    Oshkosh Wisconsin
    Posts
    65

    Default changing over to a 12 volt altenator

    what type of ballast resistor should I use?

  2. #2
    Join Date
    Jul 2006
    Location
    Central Florida
    Posts
    941

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    Old Ford pickup truck. I've used two in series on top of the coil, which seems to do the trick, and I haven't had ignition units blow. Converted to 12v alternator Poweraythor32E years ago. A single ballast resistor still burned out Ebeyond2000 ignition. Two did not.

  3. #3
    Join Date
    Aug 2006
    Location
    Oshkosh Wisconsin
    Posts
    65

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    Talked to a coup;e guys from a local rod club and the word was a resistor for a 55 Chev holds up the best. That's what i'm using now.

  4. #4

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    Hi. Just found this thread after I posted questions about converting. Are you changing to a 12 volt alternator or generator? Where did you buy it? What resistor did you use and how is it working? I have a 1947 Chief with the original (?) 6 volt generator.
    Thanks - Larry Gibson

  5. #5
    Join Date
    Oct 2011
    Posts
    486

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    Why do you think you need a resistor?
    I thought ressitors are used where there is two circiuts to the coil.One with full 12v to start,then the resistor circuit to run.If you size the coil no resitor on a kick start chief.BTW I put an alternatoer on my 59 tr3 and no resitor as I have a simple start /ign. circuit.
    Tom

  6. #6

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    Hi Tom. I thought I would need different coil made for 12 volt primary if I changed the battery to 12 volt. The other choice would be to add a resistor in series with the 6 volt coil.
    Larry Gibson

  7. #7
    Join Date
    Oct 2011
    Posts
    486

    Default

    I am not familiar with anyone converting to 12v and not changing the coil.A 3 ohm coil should be fine with no resistor. VW or Triumph coils,and lots other car coils fit.
    BTW the cheapest alternator setup That I have seen is the Kubota/samurai/nippondenso 40a.I got mine for a car for $70 off ebay.Internal regulator,not so noticible on car but the ugly hangs out on a bike.
    The cheapist 6v is a vw bocsh,fits the bracket,cheap, reliable and I think they are kind of period cool,.
    The CE seems like a good option for easy install and service if needed.
    The most desirable to me would be a the converted to 2 brush original and electronic regulator mentioned in the other recent post.
    Tom

  8. #8
    Join Date
    Jun 2001
    Location
    Central Illinois, USA
    Posts
    4,342

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    Quote Originally Posted by tfburke3 View Post
    ... The cheapist 6v is a vw bocsh,fits the bracket,cheap, reliable and I think they are kind of period cool,.
    ..
    The last time I shopped for a Bosch, Tom,...

    (And its been some years,... before ebay...)

    The boneyards were already dry, and the regional auto parts stores could only get me a pricey one with a shaft that stuck out the other side (Microbus, I guess..)

    And it was dead on arrival.
    Hate spending money twice, much less wasting time and busting my knuckles to find out its a dud.

    I would rather start with an Autolite "core", at least.
    Then you know somebody who can fix it.

    ....Cotten
    Last edited by T. Cotten; 01-12-2019 at 04:54 PM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

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