that's the best place for the regulator rectifier! It needs the ground to dissipate the excess heat and there is a black wire (ground) that is secured on one of the bolts that also secures the regulator rectifier.
I added an old desktop pc fan, connected it to the rear presence/brake light and secured it with zip ties over the regulator rectifier to help dissipate the heat...
After you fixed the broken cable, have you fully charged the battery and has it kept full charge after driving for a while?
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