I found that the Schematic in section 22-8 in the service manual reflects the REAL layout of the circuitry for the Headlights. (Unlike the the Electrical Trouble Shooting Section 8-1 & 8-2 which are incorrect) 22-8 clearly shows that what I had surmised, is unfortunately correct. The 2 Hi Beams are on separate circuits. The right Hi Beam is powered from the secondary side of the Hi Beam relay - as one would expect. However, the left one gets it's power from the Hi Beam switch and the primary side of the Hi Beam Relay. Thus, without substantially changing the wiring layout and fuse sizes, etc., the only way for a conventional "single circuit" headlight modulator to control BOTH Hi Beams is by modulating the Primary side of the Hi Beam relay. Although this will work (some are doing it today) it means that the Hi Beam Relay is being activated 240 times a minute - which can't be good for its reliability. The "single circuit" type modulator CAN be used to modulate the LOW beam by tapping into the secondary circuit at the relay. It could also be used to modulate the EC Fog/Driving lights. PS: One potential advantage of the separate Hi Beam Circuits is that they will probably allow a substantial increase in the wattage of the Hi Beams without overloading the wiring. I'd want to do some more analysis before trying this, but I think you could probably double the wattage if you changed the 2 fuses involved from 10W to 15W. The unknown is whether this might overload the Dimmer Switch.
Two shrinks at Harvard have recently completed a study of "inattentional blindness" which "may help us understand why car drivers often end up causing accidents with motorcycles they "didn't see"". In the study, subjects watched a video of two teams of three people - one team in white shirts, the other wearing black-passing an ordinary basketball among themselves. Some subjects were told to count the number of passes by either the white or the black team (the "easy task"). Others were told to keep separate mental counts of bounce passes and aerial passes (the "hard task").
During the video, a woman carrying an umbrella walks through the scene. In another version, a woman in a full gorilla suit walks through. In a third video, the gorilla stops in the middle of the scene, thumps its chest, and walks off. Here's the scary part: Forty-six percent of the subjects did not see the umbrella woman or the gorilla in the first two versions. In the third version, 50 percent didn't notice the gorilla.
The Harvard profs say that people concentrating on one task do not see something unrelated because they are not expecting it. "The intuition people have is that something different like that will jump out at them and they will notice it - but their intuition is wrong." In a sea of cars, a motorcycle could be that "something different" the driver does not expect, and therefore does not see. Some of the subjects in the study did not believe a gorilla walked through the scene until they were shown the tape again.
Another study shows that the more experienced a driver is, the more likely this "inattentional blindness" is to occur. They suggest that years of driving train someone to look for the expected, not what is actually there.
The bottom line is to be as conspicuous as possible. They (the Harvard profs) go on to say, "while nothing can guarantee you'll be seen by car drivers, such attention getting equipment as modulating headlights (legal in most states), along with brightly colored clothing and helmets, may help." They close by saying, "just because the driver is looking right at you, that doesn't mean he or she really sees you. After all, half the people never saw the gorilla."