To obtain full control of your OEM alt you can pull the IPDM wire (regulator control)
And it will always charge at 14v and should give all the amperage.
You should try this first to test voltage drop.
The replacement Alt will most likely be a 1 wire type however if it is a 3 wire just like the factory you'll need to pull this wire or the IPDM will control the alternator and give you the same issues.
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