It’s been a long time since I have worked on a TD-20, so I went and took a good look at an extra magplate on hand. Looking at the back of the coil, there is a short, 2-3″ black wire that goes to your left and straight to ground with a hex nut connection. To your right are two wires, mine are green. The longer wire goes underneath the lamination to the points, the shorter wire goes above attaches to the top of the coil lamination on your right side.
Each set of points has two wire connections. The connection closest to the coil is where the longer coil wire and the condenser attach. The further connection is where the kill switch wire connects. So the kill switch wire is independent, and connects the points to the top side of the insulated post/housing. Both kill switch wires go to the same point so they are two different lengths.
The connectors at the insulated post/housing are alternated with insulating bakelite washers, and because of the insulating washers does not ground under running conditions. The only metal touching the wires is the screw/post. The kill switch comes into play when the magneto advance lever gets moved all the way to the operators left, and contacts the bell shaped housing on the bottom of the magplate, The bell shaped housing contacts the screw/post, and shorts out the points, shutting down the ignition.
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