U Electronic ignition

jnf · Feb 25, 2020

I have a U with electronic ignition, 12volt negative ground. Includes a ballast resistor between ignition switch and coil. If I run a wire to provide full 12 volts to coil while starter is engaged only, will this aid in starting and will it harm the electronics module?

Cliff Nelson · Feb 26, 2020

The electronic ignition module should have 2 wires going to it, One connected to each side of the coil. The one on the ignition switch side should be connected between the switch and the resistor so it gets 12 volts. If not, try that first. If it is that way, you should be able to wire it like you asked. Also, make sure the coil needs a resistor in a 112 volt system. Check the resistance between the small terminals, 3 ohms does not need a resistor while 1.5 ohms needs a resistor.

rvirgil_KS · Feb 26, 2020

With electronic ignition it likely would not aid in starting, and would be a good chance it would let the smoke out of the ignition module.

The resistor is used to limit current through a 6 volt coil on 12 volt system. If you bypass the resistor you will increase current through coil and the electronic ignition module. The increased current is likely to fry the ignition module. Also the original U switch and starter had no provision for the bypass wire.

If it were mine, I would replace the 6 volt coil and resistor with a direct 12 volt coil (NAPA IC14SB or equivalent) and eliminate a potential trouble spot.

Super Duper high energy coil will be of little or no added benetit on a 4 cylinder low RPM tractor.

U Electronic ignition

jnf

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Cliff Nelson

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rvirgil_KS

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