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Check for power to the plug at the seal beam using a test light.Low beam has power to one of the 3 prongs.High beam on should have power to both.Power to both would be seal beam burned out I think.

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Be sure to check your junction box connections, there bad for doing the same thing, high beam, low beam, turn signals etc.
-Gary Burnette-
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Have you checked the sealed beams. I have no explanation for it, but I have seen many times when the high beam burns out on one side, the other one goes too. This was very common before the days of halogen lights and I have seen a lot of people go to a lot of work before checking the easiest first.
Kenneth
Fredricksburg, Texas
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Hitting on all eight cylinders
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Help -- High beams on my 59 Ford quit working -- checked fuses -- checked wiring -- replaced foot switch still no luck, any ideas?
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