Posted by John T on February 17, 2009 at 11:21:55 from (71.55.26.69):
In Reply to: Ford 12v conversion posted by sandcrabsteve on February 17, 2009 at 10:19:26:
Steve, I agree with the other fine gents, do JUST AS THAT COIL SAYS i.e. USE AN EXTERNAL VOLTAGE DROPPING (12 to 6) BALALST RESISTOR otherwise the coil will get too hot and the points will burn up prematurely.....
Coils labeled "12 volts" or "12 volts NOT for use with external ballast resistor" are just as they say and indeed full true 12 volt coils no ballast required... HOWEVER ones labeled "12 volts for use with (or requires) ballast resistor" are in reality 6 volt coils and need the ballast just as they say....
The reason such coils are used on 12 volt tractors is because when cranking especially at low tems where cranking is hard n batetry efficieny is lowered there may only be 9 to 10 volts or less left available at the coil resulting in a weak spark when a good spark is needed the most.....BUTTTTTT if you use a 6 volt coil and by pass that external ballast ONLY WHILE CRANKING you get a better starting spark, then when she starts the voltage dropping n current reducing ballast is back in the circuit so teh coils is at the right current n temperature and the points arent switching more amps then designed for.
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