340 Utility Ignition Question

Michigan IH · Jun 17, 2010

Does my 340 gas utility have a resistor in the ignition system and where is it located if it does? Model year is approximately 1965?

pete 23 · Jun 17, 2010

I'm thinking the 340 is a six volt system from factory and therefore would not have a resistor. Couldn't say what has been changed since then.

Owen Aaland · Jun 17, 2010

IH used two different types of resistors. The first style was the the ceramic block with a wire wound resistor. It should be located near the ignition coil. It will have one wire from the key switch on one side and two wires on the other side, one from the starter solenoid and the other going to the ignition coil. Later systems have a resistor wire between the key switch and the "I" terminal on the starter solenoid. Another wire will run from the "I" terminal to the ignition coil.

Looking at the solenoid can tell you which style you have. If you have a single wire on the "I" terminal you should also have resistor block. If the "I" terminal has two wires attached the resistor is built into the wiring harness.

CNKS · Jun 17, 2010

340 was made 1958-1963. Only one I have seen was a 58 that had a 6 volt ignition, the 12 volt ones will definitely have a ballast resistor, unless it has a 12V coil with an internal resistor. it will be near the coil wired between the coil and the distributer.

CNKS · Jun 17, 2010

Whoops, it is before the coil as Owen says.

340 Utility Ignition Question

Michigan IH

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pete 23

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Owen Aaland

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CNKS

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CNKS

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