Short life for a set of points.

Tractorcedric · Aug 7, 2011

Neighbor has a 574 IH that takes out a set of points in a short time. He says he has had the engine rebuilt and others have worked on it. It has a new distributor. Could there be someting missing in the wiring to the ignition? Maybe a resistor? Thanks

gregk · Aug 7, 2011

I had an older plymouth that I put an Accel high performance coil on and it would burn through a set of points about every two weeks. Maybe that is an idea or not. Let us know what you find out.

mEl · Aug 7, 2011

(quoted from post at 06:28:48 08/07/11) Neighbor has a 574 IH that takes out a set of points in a short time. He says he has had the engine rebuilt and others have worked on it. It has a new distributor. Could there be someting missing in the wiring to the ignition? Maybe a resistor? Thanks

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A 12V coil should have at least 3 ohms resistance across the primary studs on the coil with all the wires disconnected. A 6V will have about 1.5 ohms and can only be used in a 12V application with a added series resistor in the lead from the ignition switch. It would be possible for a resistor if so equipped to short and have less resistance than normal or be improperly hooked up. In any case your points are being burnt by to much current flowing across them. Also while you are taking readings check the charge voltage to make sure it's not to high. Let us know what your readings are. mEl

TomH in PA · Aug 7, 2011

Also replace the condensor.

JMOR · Aug 7, 2011

And if it has a resistor, it doesn't mean that it is the correct value resistance.....those things have been sold with a wide range of values from ~ 0.3 to 5.0 ohms, which as you can see is a ratio of 17:1
What resistor you need depends on your coil & battery voltage.
Bottom line is that you want about 4 amps flowing through an ammeter (wired in series with the coil) when the ign sw is on, points closed, engine stalled. Choose a resistor to yield the 4 amps.

keh · Aug 7, 2011

Ignition switch could be bad.

KEH

pete 23 · Aug 7, 2011

That model tractor comes right about the time IH went to a resistor wire in the wiring harness from ignition terminal on starter solenoid to ign switch. Solenoid has two small terminals, one if to activate starter and other is is to feed battery voltage to coil during cranking. There will be two wires joined at that terminal if correct. I bet someone got things a little mixed up and they are feeding battery voltage to coil all the time instead of going through that resistor wire. Other possibility is if it does have the ballast resistor mounted on the engine or coil that the wires are on the wrong side there again feeding battery voltage to coil at all times. If you check coil as others have suggested and check voltage to coil with points closed and drawing current you will be able to solve the problem. Should have approx half of batt voltage to coil when not running and about 8 volts to coil when running provided it has original type coil which is a 6 volt.

Short life for a set of points.

Tractorcedric

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gregk

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mEl

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TomH in PA

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JMOR

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keh

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pete 23

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