On my stock Motomarina Sebring M1 and my Puch Cobra k-star 70cc (still using points 6v) the horns both work at idle and low speeds, but anything over about 15 mph on both bikes the horns do not work. All other electrical functions work properly.
The Puch won't sound at all, but the Motomarina makes a tiny 1/4 second chirp but nothing more even when holding the horn buttons down.
Puch is a new 6v horn.
Motomarina stock horn.
Any ideas? I searched wiki and previous forums with no luck.