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IH Tractor Model 464 gas

S

Shaftbell

New User
My tractor starts up with key in start position. When key goes to run position it dies. Question: Is there a resistor in this start system? Does it start on 12 volts and then go thru resistor to 6 volts like they used to do years ago? If no, what might the problem be?
 
You probably need a new switch, unless you have worked on it lately. Different setup than on the H and M, but on those tractors if you reverse the wires at the starter button it will run until you release the button, much the same as yours. So you might check the wiring.
 
I would look for a ballast resistor between the ignition switch and your coil that's probably defective. To make sure its not the switch use a volt meter and check the run terminal on the switch for voltage when the switch is in the run position. If there's voltage on the terminal I think your switch is ok. Boats with inboard engines also used this setup with a ballast resistor. Hal
 
(quoted from post at 16:36:53 02/12/11) My tractor starts up with key in start position. When key goes to run position it dies. Question: Is there a resistor in this start system? Does it start on 12 volts and then go thru resistor to 6 volts like they used to do years ago? If no, what might the problem be?
Click to expand...

I think you will find that the resistor is built into the wiring harness on that model. The resistor is actually the wire that comes from a connector near the ignition switch and goes to the starter solenoid. the wire itself under the insulation will be a silver/gray color rather than plain copper.

The way to tell for sure is to look at where the wires connect to the ignition coil and at the I terminal on the solenoid. If the coil has two wires attached on the battery side and the solenoid has only one there will an external resistor somewhere near the coil. If the coil has only one wire attached coming from the ignition switch and the solenoid has two on the I terminal you have the resistance built into the wiring harness.

If you find the wire is broken you can try repairing it or just replace that section of wire with copper and adding an external resistor.
 
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