I work on a 126 about a year ago. Best thing you can do is go the technical section of this site and download the wire diagram if you haven't did that. I purchase a replacement wire harness from Porch Electric. The wires are the correct colors and it was easy to install. It is much easier to remove the engine from the tractor.
The wire harness does go down by the frame rail on the right side of the tractor. There is a ground wire that attaches to one of the bolts that holds the starter-generator on the engine.
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