"Pulsing" voltage, RPM drop with load.

??? Do you mean after you shut the engine off? YES. I should have stayed that.

"Need to be looking voltage drops and checking for whether the voltage follows the rpm.
Going from 14.7 to 14.5 and 14.0, is OK but then the big drop to 13.0 doesn't make sense (if rpms were the same). Another variable we don't know is the battery charging rate. But it should have been highest immediately after starting and then drop quickly."
Rpm's were the same. I'll recheck my readings again next chance on Friday. Had to pull the ashtray but no big deal.
I will also check voltage at different RPM 's.

When I had the ammeter hooked up as stock I remember it being at 70% when first started and then settle to 50% pretty quickly.

Thanks for your help.