only other one is the kill wire if you want to have it hooked up. NOT needed, cut off gasoline valve and let it run dry each time.
Which mag do you have?
If you remove the cap and there's a rotor inside there that is gear driven and spins on a small shaft, BEFORE you remove it, notice how it's timed to the drive gear.
Anyway, most common thing is for the points to be dirty or corroded. So start with that, file them with a points file, diamond fingernail board or just sandpaper. Clean with clean paper or cloth pulled through the points and then set points gap to about 0.016-0.020.
D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time😄