Posted by Gerald J. on September 04, 2008 at 13:09:22 from (4.254.69.58):
In Reply to: 8N IGNITION posted by JOHNNYK on September 04, 2008 at 11:17:30:
6 volt coils need a resistor. Some 12 volt coils need the resistor. The resistors have a power rating and need to dissipate maybe 25 to 32 watts of power. Just any old radio resistor won't work. The one on my JD 4020 has brass screw terminals and is encased in ceramic. You also have to choose the resistance appropriate to the coil. Its been there decades as far as I can tell.
A 6 volt coil will run fine on 12 volts without a resistor, just it will overheat and eventually fry. It will give better ignition up until it fries. It may also burn the ignition points from the excess current. It will be a race to see whether the coil or the points die first.
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