The horn switch in the middle of the steering column should ground the wire to earth.
1. Make sure that the purple wire that passes up the middle of the column will make the horn work if it strikes earth. If it doesn't, check the slip ring on the column just below the indicator arm.
2. make sure the switch on the steering wheel connects back to earth via the steering column. Probably a brass tag or similar. This completes the horn circuit to make it sound.
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