We just purchased this car, so I don't know if higher wattage bulbs were used. I doubt it since we bought it from an elderly man. We tried a test light on each of the terminals on the plug going to each headlight. With the switch on low beam, each terminal was hot. But when the switch was on high beam, only two of the terminals were hot. The other test we did was to run a grounded wire directly from the positive terminal of the battery to the headlight and the low beam did work. Hope this doesn't make things more dificult to diagnose. Should we just try new relays and/or new bulbs? Thanks again.