I just had the same problem with our '90 744 TI - it was in the 700/900 FAQ!
In my case, it was a bad ground in the left front fender where the ignition components reside.
Evidently there was not enough ground available, and the high beams hogged it all.
I cleaned the back of the power stage, found a bad pin in the connector to the thing that looks like 4 ballast resistors. I also cleaned the ground at the base of the car's ABS control box.
My favorite tech advised me to clean and apply dielectric grease to all grounds and connectors, adding a zip-tie to all connectors to hold them tight.
I am doing one per week so that if I have a problem, I'll know which one it is.
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'96 855R, 95 855, '95 854, 90 744TI 377,000 miles on 7 bricks
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