When you use an external coil and a battery to power it on a magneto (instead of the mags own internally generated energy), you're simply using the mags points as the coil current switch, so in theory you could use instead a solid state switching device. HOWEVER the typical coil distributor ignitions use a magnet placed on the distributor shaft and a pickup which tells the elec switch when to trigger so that may or may not be a mounting/installation problem (depends on the mag).
That being said, if I wanted to change from a magneto to a battery powered ignition, Id FIRST go ahead and switch to a regular IHC distributor. Then if you want to replace the points with an elec switch it may be easier PLUS as reported below, you will have an RPM based spark advance curve versus the mag which has only two timings, start and run.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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