Jay, the sport headlight uses 9007s in the outer positions as a low/high beam lamp. 9004s are used as the inner high-beam only lamp, using only the high beam filament. The non-sport headlamp uses a single 9004, as you know.
Thomas, nice job on the relay box. Looks professional.
Redneckdr... ... Huh? I'm confused. After I changed the positions of the A and B wires on the non-sport headlight socket in my truck, I plugged it directly and without difficulty onto the 9007 lamp in one of my sport headlight assemblies. In other words, the electrical sockets for the 9004 and 9007 lamps are the same, just the connections are different. I think what you meant to say was that the 9004 and 9007 lamps cannot be swapped in the sport headlight housing, because of differing lamp indexing tabs, and a 9007 lamp can't be used in the non-sport housing for the same reason.
I suggest that if anyone chooses to run the 9004s on low beam, they at least put a switch on that circuit so they can be turned off when traffic is approaching. The 9004's reflector was never designed to direct light on low beam, and its use into oncoming traffic rates right down there with the stupid overuse of 'town' lights, 'fog' lights, 'driving' lights, 'auxilliary' lights, and/or high beam headlights.
Just because nobody flashes you doesn't mean that your lights aren't annoying or dangerous. It used to be that drivers in general had a good education in highway courtesy and headlight operation. Nowadays (that really dates me!), many drivers seem to have a "pi** off, screw you, I can do anything I want, even if it blinds you" attitude, and couldn't care less about where their headlights are aimed either.
I've given up flashing these inconsiderates, partly because I can't tell whether they are really on high beam or not, and partly because, in these times, there is some risk of repraisal, and my ability to defend myself is severely limited by the gun laws and other statutes of the Land. But I digress.
I did flash a Dodge truck the other night; either he had his 'fogs' pointed at eye level, or they had been replaced by driving lights. He didn't bother to turn 'em out and I was quite blinded because of it.
Remember, the oncoming driver might be a TDR member, even if he's driving the family Dynasty! Please be courteous and dim those brights (and fogs, and towns, and drivers, and auxilliaries!)
Tom