Alternator Full fielding..??

Whatever the drop is you measure will be added to the VR setpoint. So "if" the VR is not faulty it will want to charge about 14 when warmed up. If you measure 1.5V in the drop test, it will "run" the battery at 14+ 1.5 =15.5 V
Ok, so I still need to look further due to it shooting up to the 18volt range. Swingn’