Been reading through, replaced my RR as it was steady at 14.95 and wires and connectors were either brittle or burnt / melted.
Now testing indicate the following:
Not running or key on - 13.1v
Key on - 12.6v
Motor running - 14.2 steady up to 5k for 2 - 3 minutes, stopped testing
The OEM stater wires are hot, but not so much that I can not touch and hold them - the new wires no temperature change
Thoughts on potential problem