While my bike was charging today, I took a close look at the charger indicator lights. One big issue is that the charger is installed upside down, compared with the illustration contained in the owner's manual for the 2012 S and DS models. Also, it appears that the light from one indicator bleeds over to the adjacent indicator, making it look like they are both lit. But, by standing on my head, I finally figured out what was going on.
When recharging after a ride, the charger lights up the "11111" ammeter position (which bleeds over to the "1111" light). As near as I can tell, it stays at that maximum charging indicator until the charger shuts off and it goes on trickle charge, which gives you a green light on position "C" on the set of four indicator lights located above the ammeter indicators as shown in the manual.
When the pack is bulk charging, position "D" lights up yellow, indicating that the AC is on. But it's yellow light bleeds over to position "E", which is the fault indicator and should turn red (which I have never seen), not yellow, if the charger has a problem. I just checked the lights again and light "C" is flashing yellow, indicating that the charger is in its "absorption" phase and charging is nearing completion. The Kill A Watt is showing a charge rate of 950 watts.
The charging is now complete. The meter is reading 7 watts, light "C" is now green, the light above it is yellow, indicating that the charger is still plugged in, and the ammeter is dark.
All-in-all, it is probably best if you just don't look at those lights. It will make your head spin less and the knees of your pants last longer.