I converted several to 12 volts and always kept the old 6 volt starter and all worked okay. A 6 volt solenoid (electric/magnetic switch, if thats what you have versus a mechanical switch) can still work also but if it ever burns out due to too much current and heat simply replace it with a 12 volt.
NOTE 1 it is a bit tougher on starter drives (Bendix) but mine all did okay despite that. Myself and my friend Bob M suggest if you convert and keep the 6 volt starter use a standard or lighter duty 12 volt battery (or even lighter gauge cables) NOT a huge honkin 1000 or more CCA as thats even tougher on starter drives.
NOTE 2 I have heard instances when a tractor had a Magneto ignition that the 6/12 cranking speed was so fast the mags (they do change timing at X RPM ya know) were firing at the advance run timing (maybe 20 BTDC) versus the needed like 0 Degrees start/impulse timing and that causes obviious problems.
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Today's Featured Article - More Memories of a Field Service Engineer - by Brian Dye. Introduction: The author worked for one of the largest Ford tractor dealerships in England as a trouble-shooter on tractor engines, hydraulics and combine harvesters from 1963 to 1972. In 1972 he became a dealer manager and finally left the dealer net in 1975 to run his own electronic design and manufacturing company. [Editor] We live right in the middle of Norfolk. The dealership that I worked for sold Fordson Tractors from the 1920's and some of t
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