Headlight Problem, Geo metro

Headlight Problem, Geo Metro;
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 and the two un-common wires (W/BL, left headlamp, and W/R right headlamp) 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 they would go to the fuse block first.
Regards, Ron Jacobson
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Just as a thought, try grounding the W/Bl wire from the left headlamp and the W/R wire from the right headlamp to the frame, and make them a common ground. I'd assume if those 2 wires eventually ground, they make a complete circuit, so if you ground them both to the frame, they'll both work. Just a guess tho. Worth a shot.

:frown:
Geozukigti'
I tried grounding both right and left wires that were uncommon, and no help. There was only about 1 volt difference between the wire, and ground, but the same voltage on both wires.
Ron

my next step would be to replace the sockets the lights plug into. You can buy better sockets at autozone or pepboys. Maybe the socket is fried.

Hi I had a problem with the headlights on my 1994 Geo XFI. I I found a corroded connector and thought I solved the problem.

The headlights are connected on separate circuits so only one will fail at a time.

One night around 11pm on I-70 100 miles from the nearest town in Utah both headlights went out. I sat along the dark highway for hours looking for the problem with a flashlight and finally at 2am found the plug from the from the bright/dim switch to the fuse box was very slightly loose. The next morning I bought a plastic tiedown and secured the plug to the fusebox.

I would first look at this plug, when I jiggled it I lost or had dim headlights. If you get any variation in the headlights by wiggling the plug strapping it in placed solved the problem on mine. Good luck.