Posted by John T on July 21, 2016 at 11:38:21 from (216.249.81.101):
In Reply to: resistor posted by tractor12 on July 21, 2016 at 09:52:42:
If you're asking about the situation where you want to use a 6 volt coil on a 12 volt tractor, here's the answer:
You "could" use just a 1 ohm 10 watt ballast resistor, and the spark would be good and strong for a "while" and she would run great for a "while", HOWEVER; a) The points will burn sooner,,,,,,,,, b) The coil run hot and may overheat,,,,,,,,, c) And the resistor, being only 10 watts, WILL EVENTUALL OVERHEAT AND BURN UP.
THATS THREE REASONS WHY NOTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
A typical old tractor ignition ballast resistor for using a 6 volt coil on a 12 volt tractor will be more like 1.2 to 2 ohms range, and power rated for at least 25 watts (6 volts x 4 amps = 24 watts).
If you already have the 6 volt coil a correct ballast resistor IS CHEAP and so easy to wire between ignition switch and coil. Or buy a full true 12 volt coil no ballast required BUT THAT COSTS MORE THEN A BALLAST IF YOU HAVE A GOOD 6 VOLT COIL
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