The horn relay is the small black box with 3 wires connected to it on the upper driver’s side of the ’49 firewall. They are inexpensive and easily obtained, as the same horn relay was used on 1934-52 Cadillacs and probably other GM cars as well. You can merely replace it and see if this corrects the problem. If you prefer testing it first, have an assistant press your horn button. Assuming the horn does not blow, connect a jumper wire from the center terminal of the relay to the left hand terminal; that is, the terminal closest to the center of the car. If the horn then blows, the problem may be with the relay.

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