Alternator is outputting 18.9 volts. I'm also measuring a 4 amp parasitic drain on the battery. Is it the voltage regulator, or does the whole alternator need replacing? Bought the car with 230k on it; it now has 319k - I've never replaced the alternator. And if I have to put the vehicle in "service position" where are the instructions for a 2013 Jetta - can't find them anywhere online (wait; found procedure here, but had to use Bing AI to find it).