Bob, what you are looking at is a poor ground at one of the headlights. The grounds are at the end of the strip where the hi-lo relay hangs, for the left side, and at the washer bottle bracket on the right side. It could also be a corroded headlight socket. Try wiggling both first.
With some resistance in the ground, some of the voltage being delivered to the low beams is seen on the high beam filament, which is in parallel with the blue light on the dash.
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Art Benstein near Baltimore
"Always go to other people's funerals; otherwise, they won't go to yours."
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