So I should use the pin method and see what the vr is seeing when plugged in? Or disconnect and check?
Ok when your ready we can start at the beginning. Completely reconnect the charging system so it's ready to go, then start the engine and set the idle to 1200-1500 rpm. Turn on all the accessories in the car, headlights on high beam, interior light etc. Leave the flashers/blinker off. We want a constant load. Now take these readings:
A- Battery voltage. Positive test lead on the positive battery POST (not the battery wire terminal). Negative test lead to the negative battery POST (not the wire terminal. Write down the voltage reading as A.
If your digital volt meter doesn't auto-range, select 4 Volt DC scale for better accuracy. Then-
B- Alternator output ground side voltage drop: Connect the negative test lead to a clean bare metal spot on the alternator housing. Connect the positive test lead to the Negative battery post, (not the battery wire terminal). Write down the reading as B.
C- Alternator output positive side voltage drop: Connect the positive test lead to the output (+) terminal on the alternator, attach the negative test lead to the battery Positive Post. Write down this reading as C.
Here's a how to video: https://www.youtube.com/watch?v=_B0LjwQbUbg
Turn the idle speed back down and shut off all the accessories. Turn off the engine. Post your readings when you have a chance.