City bike headlight

Larry Wright /
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I’ve recently given new life to my 1976 cimatti citybike with the minarelli v1 engine. All is fine with an exception. As the bike is idling on the stand, the headlight and tail lights work great , bright and strong. Brake lights also function properly. When I mount up and ride, the headlight goes out and only the brake lights work. I’m stumped. Any advice?

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