Re: 35 Horn
The vibrator coil should pull the diaphragm enough for the points to open. If everything is right then it will do this opening and closing very rapidly but if it won't open the points then it won't kill the magnetic field in the coil core so there will be no vibration. If the points open then they have to close as well but this is all that they do in this relationship. The rest is up to the electromagnet design and whether it has enough power to start the vibration process. The coil of magnet wire should have a specific number or turns and gauge of wire that will give it enough magnetic attraction or gauss with the voltage applied. If the coil has a short or an intermittent open condition then it would likely never work unless rewound with good wire but I don't even know if this can be easily done. There could be a problem at one of the soldered connections too. An Ohms meter could be used to see if there is at least continuity and what the coil ohms are currently. I have no idea what they should be. This could check the points opening as well. It shouldn't take too much pressure to open the points but is has to have enough for them to close again too. It all happens at high speed so it has to be right to function.
Ford used to power the horn with a hot wire direct to the generator in the early days and the horn button provided the ground path but a lot of these modern replacements have to have a horn relay to make them work with heavier wire for the amperage flow and connections close to the battery or generator. The horn button would only ground the relay to make it work and the relay switch would allow the high current flow to the horn or horns. Two horns draw a lot of current and sometimes the generator and battery have to both be functional in order for the horn to work on 6-volt systems with two vibrators in the circuit. One horn isn't as bad since it only has half the current draw.
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