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Resistor Block

If you are referring to the one used in the ignition system, it adds resistance to the primary circuit, limiting current to a level that's safe for the points and coil.

Also, it can be bypassed by a connection to a special terminal on the starter solenoid to give a hotter spark during cranking when the starter is pulling down the battery voltage.

The other option is to use a "true" 12 Volt coil which has more primary windings to accept the full battery voltage without excessive current draw.

These usually work pretty well, but DO prevent the use of the starting bypass circuit previously described.
 
How would you know if the correct coil is on the tractor currently? Would there be any problems with the full voltage coil and a resistor block being used?

Thanks
 
If you're lucky, there'll be some vestigial printing, usually in white on the black paint covering the coil housing, to indicate whether it might be a coil meant to operate on 12 v without a resitor. Lacking that, it's pot luck.

Not exactly a harm -- it won't hurt anything, but the tractor just won't run right if at all -- to run a resistor in the line ahead of a coil designed to take a 12v input. The effect of the resistor is to reduce the 12v to 6v. I don't know enough about how a coil works to say that it would be a direct reduction, but . . . you get the picture.

Worth tryin' anyway. Can't hurt. Might work if you've got the 6v coil.
 
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