'63 2000 ignition (?) problem

If the conversion was done without a resistor (or resistor coil), the coil and points will fail quickly. Also, coils with internal resistors don't seem to last very long.

You need isolate the problem to the ignition system, if possible. When it starts acting up, will closing the choke help? If so, then look in the fuel system.

When it's running good, check to make sure you don't have a dead cylinder by pulling the spark plug wires one at a time. It could be that one or two cylinders are missing all of the time, and you lose another once it's warmed up.

You need to see if there is an external resistor on your tractor. You can look for it, but you might not find it. You can test for a resistor with a voltmeter:

1. Turn the ignition switch on.

2. Read the voltage from ground to the coil terminal that is connected to the distributor. If this voltage is not zero, then the points are open and you'll have to bump the starter until the points close and the voltage drops to zero.

3. Once the points are closed, read the voltage from ground to the coil terminal that is NOT connected to the distributor. If this is 12 to 13 volts, then there is no external resistor. If the voltage is around 6 to 8 volts, then you have an external resistor.

The coil you need is a standard automotive coil available at most auto parts stores. Just bring in your old coil and they should be able to match it up. Not all stores carry internal resistor coils if that's what you need, but most will. Alternately you can add a resistor.

Do you have an external resistor?

If so then you need a 12V coil with external resistor. If you don't have an external resistor then you will need the 12V coil without external resistor. It really is that simple. Look around and see if you can find a resistor or you might still be able to read the markings on the side of the current coil if you remove it. A resistor is about 3 inches long and should be hooked to the + side of the coil between the switch and coil.