Posted by rankrank1 on March 21, 2015 at 14:14:56 from (166.137.14.91):
In Reply to: '40 Farmall H posted by Rwverde on March 20, 2015 at 21:20:56:
First, Your posts totally contradict themselves. First you say everything is there except the coil and then you say everything is missing. Which is it?
Second, I suggest you do a little more google searching and learn the basic difference between a magneto ignition system and the delco distributer ignition system principles invented by Charles Kettering.
Magneto: A mag generates its own electrical power for the ignition system. The one wire going to a mag is simply a ground out wire that shorts it out to kill it. In other words the tractor battery supplies no power whatsoever to the ignition system. So if the tractor is 6 volt, 12 volt, 24 volt etc it will not matter to the mag as it is its own self contained power generating unit totally isolated from the battery. Tractors that are hand crank and lack electric start will defiinitely be mags. That said tractors can be electric start and still have a mag as well.
A Delco type distributer: The battery supplies power to provide the spark in this system. You may or may not need a resistor for the coil depending on the coil type used and the tractor battery voltage used.
Hillbilly hodgepodge system: It is possibile to do a hillbilly Charles kettering ignition conversion to an otherwise non-functioning magneto. This is done so the battery can supply power to a mag that has bad magnets or other problems that hinder it unable to generate its own power for the ignition. It is a cheap fix compared to having a mag rebuilt to correct its problems. I would not convert a rare mag, but a common one that is valueless then who cares.
Disadvantage to any magneto system is that there is no spark advance for different rpm ranges when the tractor engine is running. Basically spark advance is optimized for the wide open throttle setting only and is less than optimum anywhere else in throttle range. In short tractor runs slightly less good at partial throttle settings due to this.
Distributer systems often have centrifugal weights that automatically adjust spark advance within the distributer based on engine rpm. So the spark timing is real close to perfect for every rpm range on the tractor instead of just at the one WOT like a mag.
If everything is missing on your tractor then buy a used disributer as it is the far superior system to a mag. No way would I buy a used mag unless I wanted the tractor to operate without a battery.
I have no idea how you could be correcting all the wiring woes on your tractor when you do not even understand what you have: Search Bob M diagrams on this site for very helpful wiring diagrams for each type of ignition system when doing 12 volt conversion.
This post was edited by rankrank1 at 14:50:07 03/21/15 8 times.
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