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Farmall & IHC Tractors Discussion Board

My Observation on 6 to 12 Volt Conversions - Rather Long..

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Posted by farmallhal on December 17, 2010 at 09:47:12 from (76.2.176.204):

Conversions to 12 volt systems and trouble shooting the problems seem to occupy a very large amount of the recurring problems on these older Farmalls at least on this forum. I have a Farmall H I had to convert to 12 volts as the PO had built up a very high compression engine in it which I believe he intended to use as a "sleeper puller" as it looked totally stock. The only way to start that tractor was a pull start when it was 6 volts. I sought a lot of information both here on the forum and through emails with a few folks and used Bob M's diagrams and some of his advice through emails in my conversion along with information provided by other folks who post on this forum. I have a perfectly working conversion with none of the issues which continue to appear on this forum. I used a Hitachi alternator which would mount up under the hood with no cutting or other significant modifications and it looks truly stock when standing next to it.
My BIL has a Farmall M which has been converted to 12 volts and everyone in the neighborhood at one time or another has played with it to add "their touch" to the point he never knows if it will start or run and has no idea on what to do when it doesn't. One of the folks involved with it at one time or another will tear into it and make a couple of changes and might get it to run for a hour or two and then a whole set of new issues arise.
I have formed the opinion that these 6 volt tractors are best left as 6 volt and keep the system working as it was designed too. I have several 6 volt Farmalls that are as trouble free as they can be. In most cases I've had to fix a problem or defective component along the way but those tractors have a wiring diagram and components which are just like the parts catalog and in the manner they left the factory. My 6 volt tractors start in cold weather just like any 12 volt tractor will. The only limiting factor is my desire to get on one down below zero. At least keeping them stock you have published documentation on how they are wired and suppose to function. These resistors, diodes, switches, lights, one or three wire alternators and all the other stuff which is introduced in these conversions just totally adds far too much confusion in trying to keep them functional. My BIL has used a 6 volt tractor of mine on more then one occassion to get his hay in the barn or keep his fields maintained.
I might be lucky but I have a very good auto electric repair shop in town which is very good on farm tractors. The only generator repair I have had which exceeded $15 to $20 was when I needed a new armeter for my Super C. I keep a good generator and voltage regulator on hand to replace one which might go bad but that is so rare. Sorry for the rant but my 6 volt tractors are a true pleasure to use and repair when necessary, Hal.

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