Posted by John T on April 08, 2009 at 10:14:12 from (66.244.97.31):
In Reply to: Farmall 460 coil posted by redhot on April 08, 2009 at 06:53:45:
Redhot, for something relatively simple, this still gets a lot of questions, so I will try to explain it all:
1) On 12 volt tractors that use a 6 volt coil, one needs an external series voltage dropping (12 to 6) Ballast resistor wired in AFTER the Ignition switch but BEFORE AND AHEAD OF the Coil so it drops 6 volts leaving 6 for the 6 volt coil so it dont overheat.
2) An advanatge of such is that while cranking when battery voltage is reduced, its possible to by pass jump around an external ballast to get a hotter starting spark, but then once shes no longer cranking, the ballast is back in the circuit so a 6 volt coil only sees 6 volts and all is well.
3) Such by pass (while cranking) can be accomplished EITHER by a starter solenoid that has the extra lil "I" terminal or else a saddle mount mechanical push start switch with the extra lil terminal. Either of those goes direct to the coil after the ballast (or on low side of ballast) so hot unballasted batery voltage is applied to the coil ONLY while cranking.
4) An alternative on a 12 volt tractor is simply use a full true 12 volt coil (what some refer to as internally ballasted) in which case NO BALLAST IS REQUIRED..... However, in thar case one cant utilize a solenoid or switch by pass system to get the advantage of a hotter spark while cranking, but on a good 12 volt system she ought to still start okay ifffffffff all else is in top condition with no 6 volt coil and ballast and start by pass system in place.
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