Re: 12 v conversion ballast resistor

Posted by John T on March 31, 2007 at 06:33:09 from (66.244.90.5):

In Reply to: Re: 12 v conversion ballast resistor posted by Ron in Nebr on March 31, 2007 at 00:48:44:

Ron, If you use a full true 12 volt rated coil THEN NO EXTERNAL BALLAST IS REQUIRED. You have to be careful regarding coil ratings n labels as a full true 12 volt coil may be labeled "12 Volts" or "12 volts NOT for use with external ballast" HOWEVER BEWARE if its labeled "12 volts for use with external ballast" its in reality a 6 volt coild and does require the ballast as it says !!!!!!!!

Typical 6 volt coils have a primary resistance of around 1.25 to under 2 ohms while a true 12 volt coil has more like 2.5 to 3.5 ohms primary resistance. Some people call 12 volts coils "Internally Ballasted" and most achieve their higher primary resistance from more wire length or higher resistance wire versus any internal discrete carbon resistor.

Hope this helps

John T

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