Headlight Problem, Geo Metro

Geo Metro, 1995, Headlight Problem;
One Headlight is Bright, the Other Dim. When I unplug either light, the other one goes out. There is a single headlamp relay in the relay panel, for both headlights, so I assume that the on/off switch on the steering wheel blinker is not a problem. There is a R/W wire going to the outside terminal of each headlamp. There is also a red (R) wire going to the other outside terminal of each headlamp headlamp. The middle wire terminals are different in color. W/BL, left headlamp, and W/R right headlamp. So, I assume that these two wires go to different areas, but I don't know where. I found a schematic in the local library, and it shows that the common wires (R and R/W) go to one area of the fuse block the un-common wires go to a different area in same fuse block. I cannot tell where they go. inside the fuse block, and beyond that, the schematic is not complete enough. I read the correct voltage on the left side headlamp terminals, but only about half that on the right side lamp terminals. I assume that this is the crux of the problem, but can't figure out why. Can anyone enlighten me? Is there anything else I can try? Why does the other lamp go when I inplug the first? I would think that the lamps would be in parallel. If one lamp burns out, the other should continue to burn. looks like a safety problem. Is there a grounding problem? I assume that the W/B and W/R wires eventually get to ground, but don't know why the would go to the fuse block first.
PS; Where can I get a complete, understandible, circuit diagram?
Regards, Ron Jacobson
[email protected]

I just had the same trouble try a higher rated fuse I did and now both are equal in brightness

Sounds more like a burnt out socket to me. I was using higer wattage headlights in my vert and it did that. I bought a pair of aftermarket headlight sockets (2 fast 2 furious brand, lol) to replace my OEM ones. They came with the socket and about 6 inches of wiring to splice into my OEM wiring harness. The headlights were even brighter than usual with the new sockets. Older sockets are designed very weak, and are prone to burn up. The aftermarket ones have a bit heavier gauge wire, and better terminals.

Another spot to check is behind the l/h headlight, there is a ground strap that is attached to the inner fender. I had some grief with a dim adn occasionally not functioning light on a couple of my cars, both were due to that strap being corroded or broken.