Not much to add to Jims good info other then if its currently at Neg ground (even though if originally Pos ground) then the coil is wired correct if its little - terminal wires to the mags points as you indicate.....One problem when adding an external coil to an old mag n just using its points n condensor (sure it works) to switch coil current is the points may not last as long if the coils inductance is quite a bit different then the original magneto coils inductance cuz the condensor may not be the correct mfd rating..If the points seem to constantly build up a mound on one face opposite a pit on the opposite face the condensor isnt the correct size and a bad condensor can shorten the life of the points..
Bob M's wiring diagrams can get ya going other then a modified mag isnt exactly the same as a pure mag ignition or a pure coil ignition although they are close...
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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