Alternator started sparking

Are you trying to track down a .3v voltage drop?

Maybe your meter is not accurate?

Yeah. When the blue ignition wire is connected it drops .3 at the battery and then an additional .2 at the alternator. When it’s not connected, the readings go back up, with the alternator and battery showing the same numbers, without the drops. When the car is running the gauge jumps to over charging and then settles. The alternator is putting out between 14.8 and 15.3 and is not steady. I’ve run a direct power wire from alternator, bypassing the voltage regulator, to the battery for a short time and there wasn’t any voltage drops and the alternator put out around 14.2, steadily.