I'm not going to blog the complete build of the wiring harness, because I've done that a few times already for the Square and the W/NG. What I will do is show you a few details of the harness as it comes together .
This picture shows the main earth cable to the rear which splits into near the indicators. There is a soldered splice under that heat shrink.
This picture shows the harness going to the rear of the bike with that soldered splice shown before, and the wires to the indicators and the rear lamp all covered with PVC sleeving and a heat shrink section around the joint.
The bike is running an original Lucas 529 which needed to be rewired. I've replaced the cabling and used some heat shrink to provide some wear resistance where the wires go through the rear of the lamp. The connections to the bulb are blobs of solder flattened on the linisher.
Here's the engine earth. This is taken back to the main frame earth which is the upper of the two oil tank bolts.
For the record this is how I have terminated the magneto kill switch. There is a length of cable, covered in heat shrink, pass through a small length of fuel line which sits neatly inside the thimble nut on the end of the magneto.
