Re: 6 to 12 volt conversion

Posted by RAB on August 14, 2006 at 18:46:17 from (70.52.225.42):

In Reply to: 6 to 12 volt conversion posted by Stephen Hoffman on August 14, 2006 at 17:52:12:

If you wish to retain your 6 volt coil you can just add a suitable inline ballast resistor to leave 6 volts on the coil (and 6 volts drop across the resistor).
If you are fitting a "12"volt coil, it may accept the full 12 volt supply or it may be a 6 volt coil needing a ballast resistor.
In the case of the 6 volt coil, if the tractor has an electric starter, the ballast is in line from the ignition switch for normal running, but often bypassed when the starter is in operation, to apply full voltage to the coil for a better starting spark. That was the reason they were fitted to cars in the first place - to improve starting.
Regards, RAB

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