ballest resistor
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  1. #1
    Official RnS Addict Rustydicks's Avatar
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    ballest resistor

    hi guys

    can anyone tell me what resistance i should get across the ballast resistor i have a 12v coil
    on my model A
    the car starts but as soon as u let go of the key it cuts out ,
    it has power at the ignition switch and 12 v at the resistor

    hot wire it from the battery and it will run
    i have ordered another resistor
    thanks richard

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    Official RnS Addict mygasser's Avatar
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    a ballasted coil doesn't run on 12v. the ballast resistor cuts it down to summat like 9v for normal running but is bypassed on crank to give the 9v coil 12v for a hotter (temporary) spark when starting. the 9v going through the points makes them last longer as the spark there is smaller than if it was 12v.
    need a job done on your project? i may be able to help.

  4. #3
    Official RnS Addict Rustydicks's Avatar
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    my dizzy doesn't have points do i still need a ballast resistor ?
    rich

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    Official RnS Addict MikeS's Avatar
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    If its a 9v coil then yes otherwise 12v will quickly burn out the coil. If you want to get going quickly then just change the 9v coil for a 12v one and bypass the resistor
    Money talks; unfortunately mine just says "goodbye"

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    Official RnS Addict Rustydicks's Avatar
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    so if i have a 12v coil i do not need to have a resistor ?

  8. #6
    Semi Proffessional Prat sidspop's Avatar
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    No
    Its either you lay down and die or you get on with your shit till you do!!!!! No Other Way Around It. One or the other. Don't worry about being forgotten, you will. Rather worry about in how long it will take for you to be forgotten, bro.

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    Official RnS Addict stu460's Avatar
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    ^ that depends on what type of ignition module you are running. If you have a Mallory E-Spark or Unilite one in the dizzy then yes, this needs a 1.4 Ohm ballast resistor, feed it 12v and you'll kill it. Been there, got the T-shirt.

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    Official RnS Addict choppedblownpop's Avatar
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    As above, Mallory/unilite you do need a ballast resistor

  11. #9
    Official RnS Addict Rustydicks's Avatar
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    cheap chinese dizzy

  12. #10
    Semi Proffessional Prat sidspop's Avatar
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    Measure the resistance of the ballast, you should have a few ohms. If no continuity it is goosed.
    It sounds to me more like you have lost the feed to the ballast. Check for a voltage at both ends, one end should come from ignition and be live with 12 volts, the other end about 9.
    If not 12 volts, get a separate wire from ignition and run it to top of ballast. From bottom of ballast is feed to coil. At that same bottom terminal (or terminal on coil) ensure there is a wire from starter motor that has 12volts on cranking.
    So possibilities are
    a) ********ed ballast
    b) dodgy wiring
    Any problems shout.

    Andy
    Its either you lay down and die or you get on with your shit till you do!!!!! No Other Way Around It. One or the other. Don't worry about being forgotten, you will. Rather worry about in how long it will take for you to be forgotten, bro.

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