I discovered that I also have the [https://www.amazon.com/Honda-08A30-MCS-100-Accessory-Wire-Harness/dp/B00656YJ82/ Quartet Accessory Wire Harness] '''Honda 08A30 MCS 100''' Although there's a link on Amazon, it is unavailable for purchase there.
Installation instructions can be found on the ST-Owners forum [https://www.st-owners.com/forums/attachments/0007-st1300-quartet-harness-installation-20051207-01-01-pdf.5357/ Quartet Harness Installation instructions] can be found on the ST-Owners forum with a photocopy of the original 4-page install instructions [https://www.st-owners.com/forums/attachments/honda-quartet-harness-power-plug-installation-instructio-pdf.5965/ photocopy of the original 4-page install instructions] too. (both Those are linked from [https://www.st-owners.com/forums/threads/st1300-quartet-harness-installation.7714/ this forum post]but without comment, and the whole thread is pretty content-free.)
See Also: [https://www.st-owners.com/forums/threads/st1300-quartet-harness-farkle-wiring-guide.26091/ is the ST-Owners article about farkle wiringguide]
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