Sans any definitive information, make, model, year... why you started wholesaling new parts... (none came thru).
You ought go back to the basics...
Fire, fuel & unrestricted exhaust...
On Board Diagnostics (OBD) might be pointing at several things...
You can also check manufacturer technical service bulletins for free on
bbbind.com (plus good electrical schematic, below).
BBB Industries Premium Alternators Starters Power Steering Products
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