Re: low mod 12v conversion

Posted by Gordon in IN on February 25, 2004 at 18:48:57 from (66.244.71.137):

In Reply to: low mod 12v conversion posted by karl f on February 24, 2004 at 20:21:14:

Just a few words (or more) on my personal experience with converting 6 volt tractor ignition systems to 12 volts. I have converted two (Allis Charmers WD's) to 12 volt systems using the (old style) Delco/GM alternators with external regulators. I kept the original 6 volt starter AND 6 VOLT COIL. I measured the voltage across the coil with the 6 volt ignition and duplicated this voltage by sizing the (coil) running resistor with the 12 volt system. I replaced the capacitor(condensor)in the distributor with a NEW 12 volt one. (I did not replace the points.) I kept the original (narrow) pulley on the alternators. (The crank pulley on the AC WD's will accept and function with a "narrow" belt.) I chose an "extra service" or "severe service" belt (like the ones used on riding lawn mowers) of the proper width to fit the alternator pulley. I replaced the bulbs in the lights with 12 volt bulbs. I did not need to adjust the regulators as they both provided the desired voltage when checked in service. One of these tractors has been in service since the early 1970's with no problems. The other has been in service since the early 1980's with only one replacement belt required (because the belt adjustment and tension was not properly maintained).
I have one AC WC that was converted using the original generator. The generator was "checked out" and a new set of brushes installed. A variable resistor was installed in the circuit to the field coil and adjusted to provide the desired charging voltage output. Once this resistance was determined, the variable resistor was replaced with a resistor of like value. A running (coil) resistor was utilized as above. A new 12 volt capacitor was installed in the distributor. Replacement of bulbs was also done with the exception of the (sealed beam) head lights which were wired in "series" ot utilize the 6 volt "sealed beam" bulbs and spare 6 volt sealed beam bulbs "on hand". This conversion on this tractor has been in service since the early 1970's with only one replacement of the "original size" belt. (The belt was not replaced at the time of the 12 volt conversion.) I plan on converting another AC WC the same way this spring. Hope this information is of some help to someone, Gordon in IN

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