Dear JMOR and others, Many years ago I checked the amp draw of a 12 volt system on an engine mounted on an engine stand with a Sun VAT-40. The draw was 185 amps. Then I substituted a 6 volt battery and the draw was 320 amps, with the engine turning more slowly. The same phenomenon will occur with a weak but not too weak battery. As the starter approaches stall, current flow rises as voltage drops up to a point. This apparent violation of OHM'S law is due to the fact that the starter is both a starter and a generator and when spinning rapidly produces a counter voltage reducing current flow. However, if we were to conduct this experiment with a locked engine, we would have a resistive rather than inductive load and OHM'S Law would be obeyed.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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