Obie........electronic ignitions do NOT like 6-volts. Why, 'cuz the solid state electronics quit working at about 5.7-volts. Just starting drags the 6-volt battery down to about 4.5-volts. Ittza LAW, lead-acid law. You can NOT do anything about the LAW.
Unfortunately, the squarecan coil needs the "infamous ballast resistor" ...or... the internal insulative tar melts and shorts out the sparkies. Howsomevers it takes about 1-hr fer the tar to melt. NOT yer problem.
Didja know that you can replace yer points (0.015") every year for 10-yrs for cost of poorly performing electronic ignition?
Ittza 2-bolt, 15-min job to remove the weird 4-nipple frontmount and replace the points (0.015") on the kitchen table. Just un-snapple yer capple and letter dangle. Installation is a reversal of the removal ...except... gently start yer 2-bolts and putt'chur rotor ON. Now rotate yer rotor until the OFF-SET drive tang fits into the OFF-SET camshaft drive slot. Now tighten yer 2-bolts and re-snapple yer capple. Simple, eh?
Remember to "polish" the INVISIBLE CORROSION from between the points. (0.015") Me? I use a clean $1-bill clamped between the points and pull. Iff'n yer really cheap, tear a strip from HEAVY brown paper grocery sack and use that. ........Dell, yer self-appointed sparkie-meister