[daktulos]

So, I've had a look at as much as I can - the generator looks fine (resistance within normal range, output on all three pairs rising from ~25V to ~90V going from idle to 5k RPM). All contacts clean and corrosion-free.

With the engine started and idling, the R/R was generating 14.1V. At 5k RPM it was 13.7V, with the headlight on at 5k it drops to 13.3V.

For some reason I didn't write down the voltage idling with the lights on. But, the voltage drop without the lights on would explain why the lights are dimming. At the end of the day, 13.3V means it would still be charging the battery to some degree.

So, my conclusion is that my battery isn't holding its charge as well as it did when new, and I probably need a new one at some point.

That said, I'm still a little concerned about the R/R voltage drop as the engine revs. Either the R/R is having trouble, or there's something drawing a lot of power when I rev.

Anyway, thanks for all your help!