Leaving the ignition on while testing other circuits is a big NO-NO! If the points happen to be closed, there is a constant current flowing through the ignition switch, coil, points, and ballast resistor. That overheats and burns the points, and makes the ballast resistor get hot. If you're not planning on starting the engine right away, disconnect the wire from the side of the distributor temporarily while the switch is on, or at least bump the starter over until you can see that the points are open. If you've got vacuum wipers, no amount of wiring is going to make them work- - - - - -just a thought!
Jerry
