[abefromen]

well, it charges but not as well as it should.

Voltage when engine is stated cold is a happy 14.5 and stays there until the alternator starts to heat up then voltage drops down slowly a full volt to 13.5-13.7

Toss on the headlights and it drops a little more........by this time the dash volt gauge is well into the yellow. Raising the idle a bit helps but still under 14 volts.

Belt is tight and I rebuilt the alt with all new NOS parts......voltage reg, rectifier bridge, diode trio, everything except the rotor and stator as they ohmed out ok and visually they didn't have obvious probs.

I see they sell 100 amp upgrade kits for the 63 amp 10SI alts for around 80 bux but since everything inside is already new I don't want to buy if not needed.

Would a new stator help? This company has an upgrade one for a reasonable price:

https://store.alternatorparts.com/partno27104.aspx

My alt is definitely not putting out as much as it should (just like my ex) and would like to get it back where it should be.

also when I full field the alt when it's at idle around 13.7 it immediately jumps to max output of almost 16 volts. Is this a sign of a bad regulator or at least an iffy one?