Quote: If his voltage drop is doing this & there is a 1.5v drop then why when he revs the engine does the voltage continue to climb? the regulator should limit it to the 1.5v above it normal limit IE max 16v but in reality most single wire systems limit around 14.2 plus 1.5 would be 15.7... Instead his will climb past 16v...
It could be that the drop get's worse as the amperage output increases.
It could also bee that the drop is one issue, and that the alternator is shorted internally too.
I'd chase the drop issue first, then see what happens
