David,
If your handy with a few common hand tools you can make some big
improvements to your night time driving vision.

   First: Perform the relay modification.
http://neksiwel.20m.com/custom.html

  Second: Check the battery voltage with the engine running and ALL the
electrical consumers on, all lights , blowers ,A/C etc.. If it's less
than thirteen volts you have some work to do. Let us know.

  Third: Relocate the ground wires from the headlights. Presently they are
rusting away on the ground clusters behind the fuse block. I cut the
spade terminals off, replaced with ring connector and attached under the
fuse block screws.

  Fourth: Buy some H-4 replacements, now that you fixed the previous three
items your system can handle them.

--
Ken Lewis
http://neksiwel.20m.com/