Re: points

Posted by Jon Hagen on February 24, 2007 at 10:56:43 from (75.104.56.247):

In Reply to: Re: points posted by Walt Davies on February 24, 2007 at 09:48:05:

One comment on Walt's post, ballast resistors are NOT all the same. depending on the application, they vary from .5 ohm to as high as 1.9 ohm. for a 12 volt system, you want about 2.75--3 ohm combined resistance(resistor/coil) in the primary circuit.
This can be a true 12 volt coil with a 3 ohm primary winding, or a combined ballast resistor of about 1.5 ohm resistance connected in series with a coil with a 1.5 ohm primary winding.
The true 12v coil with a 3 ohm primary winding eliminates the need for a ballast resistor, but leaves you with no option to bypass the resistor during cranking/starting for a temporarily hotter spark to ease starting. Most car/truck point ignition systems used the ballast resistor and 1.5 ohm coil system because of the advantage of stronger spark for starting in cold/damp comditions.
Another reason to use the ballast resistor in a 6 to 12V conversion is that it allows you to reuse your perfectly good 6V coil which has the 1.5 ohm primary winding.

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