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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