Posted by MarkB_MI on May 09, 2009 at 02:58:15 from (74.126.1.223):
In Reply to: coil posted by ranba36 on May 08, 2009 at 18:13:57:
Generally speaking, most conversions don't add a resistor, but instead use a so-called 12 volt coil. If you're uncertain whether or not a resistor has been added to your tractor, you can check the voltage at the ignition switch side of the coil. First make sure the points are closed by verifying that the distributor side of the coil is at zero volts referenced to ground. Then check the voltage on the other side of the coil to ground. If it's between six and eight volts you have a resistor somewhere. If it's at twelve volts there's no external resistor.
Note that it's common to see conversions where the original coil was used with no external resistor. This will result in very short point life. If you suspect this is the case with your tractor, swap the coil out with one that specifies "no external resistor required".
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