@DWELDR, since the old reg/rec. was the culprit,
it 's a big chance it demaged the battery by overcharging.
I would start:
-measuring all 3 yellow cables from stator whith it other
-1with2, 2with3, 3with1...multimeter on AC
- should show by running motor between 40 and 70 volts AC
- this OK, then reconnect this 3-pronged plug and measure on the 2-pronged plug whether you have
14-15volts DC leading to your battery at about 4000 rpms.
-all that fine, battery or groundcable dead .