Not sure if this true for our cars, but this excerpt from Mad Electrical's tech page would answer the the original question. Of course the fix is as noted, relays.
Paul L.
Many
owners of Ford cars and trucks, built in the '60's and
'70's, especially with the four headlight systems, are
familiar with the headlights flashing OFF and ON.
(Like erratic Morse Code, after driving awhile on
High Beams.) The
problem occurred because the circuit breaker in the
headlight switch was weak.
Simply installing H-4's in most of our older cars
and trucks will result with the same effect known to old
Fords. (The
circuit breakers in original factory headlight switches
cannot handle the extra current draw of the more powerful
headlights.)
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