FIXED
Replaced the diode attached to the relay.
Battery charged to 13.66 volts after a two day 110 mile ride.
Notes on testing the electrical system leading to solution:
#1 Regulator/Rectifier testing - The RED wire is the DC voltage output. Voltmeter (+) on the RED R/R terminal, voltmeter (-) on GROUND. You will get varying DC voltage w/ motor running if R/R is good. View G main wiring diagram.
#2 Diode testing - The RED wire is DC voltage input to the diode. Voltmeter (+) on the RED wire, voltmeter (-) on GROUND. You wil get varying DC voltage if diode is receiving DC voltage/current from the R/R.
The YELLOW/RED is the DC voltage output to the relay. Voltmeter (+) on the YELLOW/RED diode terminal, voltmeter (-) on GROUND. You will get varying DC voltage if diode is good & outputting to the relay. Views I & J main wiring diagram.
#3 Diode/Relay/Battery relationship - DC voltage & current to flow only one way. The diode allows DC voltage & current to pass thru the relay via the YELLOW/RED wire & on to the battery. See lower right corner of main wiring diagram.
#4 Dashboard Charging Meter - This meter only indicates DC voltage is being generated by the R/R. It does not indicate the battery is being charged.
#4 Main wiring diagram - As referenced in my original post, the wiring harness battery interface in the diagram is poor & confusing.
I hope this thread saves some other owners some grief, time & $$.
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