Well, either the dynamo isn't dyning, the regulator isn't regulating - or possibly the battery has died. However, if the battery has died or become disconnected, the lights should come on with the engine and brighten with revs until the regulator regulates. There may or may not be any sign of life at the ammeter in those scenarios depending on exactly what has happened. Sounds to me as if you have things connected up OK, but there's no charge.
Suggest you test the dynamo first. An easy test is to disconnect the F and D connections at the dynamo. Make a wire bridge between the 2 - on the dynamo! - and take a wire from this common bridging wire and stick it to the metal body of a bulb. Start engine. Touch the pole of the bulb to a good clean place on engine or frame with the engine running. If the dynamo works, the bulb should light up. It should get brighter with revs. If you rev it too much the bulb will blow due to excess volts. There's a pic here on site somewhere of just such a test rig. If the dynamo passes that test, the fault probably lies with the regulator.
If the dynamo doesn't work, the easy things to check are the brushes. Are they clean and not stuck in their little slides? And you should clean the commutator they sit against. Often, the thing will work again for these little bits of attention. But not always for ever if things are very tired.
Expert advice will be at hand I am sure, and as Richard (Manosound) says there is a fair bit here on the general subject.
Like others, I am a DVR2 fan as well. Excellent solution if that's your problem, and very easy to install. I've got 3.
