Fusible link?

Fittrjoe said

I am having Voltage drop somewhere in harness I believe based on symptoms/ pulsing from 13.5 to 15 Volts - it DOES settle at 14 Volts with steady Highway cruising
Alternator and VR recently replaced and added dedicated ground to VR

Click to expand...

What you are describing sounds pretty normal.

At low engine speeds, like idle the stock alternators have a hard time keeping up with demand.

The rebuilders sometimes put a 2.75 or 3" pulley where a 2.5" should be. That compounds the issue by slowing the alternator more.