Re: 1929-31 horn button schematic

Posted by DavidM On 2020/6/28 22:27:55

Its many years ago since I set these horn buttons to work on my 2 633's and I regret not taking photos. The wire up the steering columns terminates with a tiny ferule soldered on to create a contact and to hold it in place. The insulating bush simply insulates that contact from the column and holds it in place.
The button has a brass screw under its centre that connects to earth via a washer under the top of the spring and the spring onto part of the steering column. The spring holds the button away from the live contact. When the button is pressed the spring compresses and the screw head contacts the wire completing the circuits.
Hope that helps.