I know that it's been about a month since this thread was started, but in the event that anybody stumbles across it, I wanted to post the result of my findings. With the engine running, I was reading 17-18 volts at the alternator and the battery! When running at higher RPM's on the road, my aftermarket voltmeter gage was pegging out at 18+ volts. I took the alternator into the auto part store for a test. The computerized diagnostic machine said that the alternator passed all tests. It seems strange that 17 or 18 volts would be normal output. Does this sound normal to you guys? Anyways, I purchased a new voltage regulator, installed it and the system seems good. Volt gage never exceeds 15 volts. Also, my GEN light now goes out at shutdown. I don't even have to honk the horn anymore!!