After almost 3 years of occasionally back feeding the added on 12V cigarette lighter plug for the few winter days that the Battery Tender Plus was hooked up to it, I finally installed the Tender's fused pigtail plug-in that came with the unit. The State of Georgia has a very mild, snow only once, ride-twice-a-week Winter compared to Pennsylvania, where I enthusiastically fled
from for our retirement. The body panels were already off for the 3 year antifreeze change, so the task was that much less aggravation. Body panel removal was enough disincentive to procrastinate this installation as long as I did, plus plain old forgetfulness of the (still uninstalled) pigtail when the panels were off for something else. The Pigtail is a quicker Tender-2-Bike hook up and less likely to cause a short than the homemade setup I was using before.
For the pigtail hook-up I did not go directly to the battery terminals. There is 1 additional wire terminal there on each battery pole already. Knowing it was "always hot", I used the starter solenoid's top Positive battery threaded terminal protruding nearly 1/4" (6mm). For the black (negative) pigtail terminal, the nearest high quality ground was the 8mm x 1.25 thread upper left rear fairing mounting bolt. For the plus terminal connection, all that was needed is a 5mm x .8 thread hex nut to hold the red (positive) terminal on against the battery cable terminal nut beneath it. It was quicker than loosening/removing the solenoid terminal nut to add on the Tender's pigtail terminal. Also, with 2 nuts working together, it strengthened the holding power on the battery cable power terminal to the starter solenoid and thus the starter motor. You'll see the hot terminal (red alligator clip) and the fairing mount bolt (negative terminal) in this old pic below - - so it does not show the pigtail.
After the body panels were put back on, I was able to lay the pigtail down along side the left frame member routed past the left TB (and throttle spool) to an open area where it won't be blown around to chafe/wear away the wire insulation or in any way possible be able to jam the throttle open. Here in the South, it could be January 20th before it's needed.