I've got all 4 lights on for high, just low beams for oncoming traffic. Cured problem of too much gap between lows and highs. Just a scotchlock wire splicer between yellow and white wires in harness to hood. Extra important go to low beams for oncoming traffic though!
To make all four lights stay on for high beam, find the yellow and white wires in the harness near the hood hinge. One is the main power lead, other is low beam power. By connecting them, the low beam always has power, high beam only when switched on. Use one of those blue scotchlock things that you clamp down with both wires in it. I haven't had any problems, the dash even lights up well at idle with the high beams (4 lights) on.
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