Posted by Janicholson on December 14, 2010 at 06:30:06 from (199.17.6.126):
In Reply to: Super C problems STILL posted by Idaho Ron on December 13, 2010 at 21:14:02:
All ignition systems will spark once when the key (ign sw) is turned off and to a lesser extent on) this is because the switch acts like a set of points in the series circuit. Having the plug wire fire just as you stop cranking it is not a consistant thing due to the rotor pointing to different spark plugs at different times of the rotation. The coil needs to be attached to the electrical system in the same polarity as the battary. If the battary and charging system are Positive ground (original 6 volt, and usual with 12 volt generators if using standard Delco 12v generators and regulators from 12v Farmalls) the coil should be negative to the distributor, and positive to the ignition switch. Make sure of the batt ground polarity.
Volt meters will read open circuit voltage (points open) at full bat voltage, even with the resistor in the circuit. The voltage on the distributor terminal from the coil should change from 12+ volts with the points open, to nothing with them closed (measured from ground to the terminal with the meter set on 20 volts, not cranking) if this does not happen, there is a problem in the distributor/points connections internal to the distributor.
A simple check to determine if the system is not getting enough voltage to fire when cranking is to use a separate battery to give it ignition voltage temporarily. Just use a 12v battery and a few feet of 12ga wire to connect the battery to ground (same polarity as the installed battery). Then disconnect the ballast resistor on the side away from the coil, and connect the other lead to that side of the ballast resistor. This provides a complete separate ignition source, so do not leave it connected unless you are actively working on the tractor. Make the connections so that they can be removed, as the removal will shut off the tractor if it starts. If the tractor starts now, My suspicion is that the battery voltage on the installed battery is dropping during starting such that there is not enough to make it start. Get back to us. Jim
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