I just worry about the short adapter section. Wire-gauge looks little thin. Did you use W-die on crimper or just one of those squeezy crescent shapes?
Bad battery can draw down voltage due to not charging. So that's 1st test. Also...
6. Disconnect RR output connector. Start bike. Measure DC output of RR on bare terminals.
This last test measures actual output of RR without any voltage drop from current flow to charge battery.
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